fix: remove fixed error message check

[xlgmokha]

A new version of pandoc-ruby was recently released that changes the behaviour of how the pandoc executable is invoked. source. This caused one of the tests in the default branch to start failing.

The change introduced in this PR makes the minimal change necessary to fix the failing test while preserving the desired behaviour to unblock merging into the main branch.

/cc #2849

[xlgmokha]

Re-running build because of:

     # Dependabot::SharedHelpers::HelperSubprocessFailed:
     #   Creating virtualenv meine-stadt-transparent-DpO8lN-q-py3.10 in /home/dependabot/.cache/pypoetry/virtualenvs
     #   Updating dependencies
     #   Resolving dependencies...
     #   
     #     SolverProblemError
     #   
     #     Because textract (rev 0776b86cd01fbad5b2518f75a659a1e5b614a5bd) depends on SpeechRecognition (3.7.1) which doesn't match any versions, textract is forbidden.
     #     So, because meine-stadt-transparent depends on textract (rev 0776b86cd01fbad5b2518f75a659a1e5b614a5bd), version solving failed.
     #   
     #     at /usr/local/.pyenv/versions/3.10.0/lib/python3.10/site-packages/poetry/puzzle/solver.py:241 in _solve
     #         237│             packages = result.packages
     #         238│         except OverrideNeeded as e:
     #         239│             return self.solve_in_compatibility_mode(e.overrides, use_latest=use_latest)
     #         240│         except SolveFailure as e:
     #       → 241│             raise SolverProblemError(e)
     #         242│ 
     #         243│         results = dict(
     #         244│             depth_first_search(
     #         245│                 PackageNode(self._package, packages), aggregate_package_nodes
     #   ./lib/dependabot/python/update_checker/poetry_version_resolver.rb:324:in `run_poetry_command'

Darnit Python, can't I have nice things?

[xlgmokha]

Not you too Bundler. 😞

Failures:

  1) Dependabot::Bundler::UpdateChecker#latest_resolvable_version_with_no_unlock given a gem from rubygems with a version conflict at the latest version 
     Failure/Error:
       SharedHelpers.run_helper_subprocess(
         command: command,
         function: function,
         args: args,
         env: {
           # Bundler will pick the matching installed major version
           "BUNDLER_VERSION" => bundler_version,
           "BUNDLE_GEMFILE" => File.join(helpers_path, "Gemfile"),
           # Prevent the GEM_HOME from being set to a folder owned by root
           "GEM_HOME" => File.join(helpers_path, ".bundle")

     Dependabot::SharedHelpers::HelperSubprocessFailed:
       undefined method `name' for "Gemfile":String
     # /home/dependabot/dependabot-core/common/lib/dependabot/shared_helpers.rb:120:in `run_helper_subprocess'
     # ./lib/dependabot/bundler/native_helpers.rb:44:in `block in run_bundler_subprocess'
     # ./lib/dependabot/bundler/native_helpers.rb:40:in `run_bundler_subprocess'
     # ./lib/dependabot/bundler/update_checker/version_resolver.rb:82:in `block (2 levels) in fetch_latest_resolvable_version_details'
     # ./lib/dependabot/bundler/update_checker/shared_bundler_helpers.rb:54:in `block in in_a_native_bundler_context'
     # /home/dependabot/dependabot-core/common/lib/dependabot/shared_helpers.rb:48:in `block in in_a_temporary_directory'
     # /home/dependabot/dependabot-core/common/lib/dependabot/shared_helpers.rb:48:in `chdir'
     # /home/dependabot/dependabot-core/common/lib/dependabot/shared_helpers.rb:48:in `in_a_temporary_directory'
     # /home/dependabot/dependabot-core/common/lib/dependabot/shared_helpers.rb:37:in `in_a_temporary_repo_directory'
     # ./lib/dependabot/bundler/update_checker/shared_bundler_helpers.rb:50:in `in_a_native_bundler_context'
     # ./lib/dependabot/bundler/update_checker/version_resolver.rb:81:in `block in fetch_latest_resolvable_version_details'
     # /home/dependabot/dependabot-core/common/lib/dependabot/shared_helpers.rb:164:in `with_git_configured'
     # ./lib/dependabot/bundler/update_checker/version_resolver.rb:77:in `fetch_latest_resolvable_version_details'
     # ./lib/dependabot/bundler/update_checker/version_resolver.rb:43:in `latest_resolvable_version_details'
     # ./lib/dependabot/bundler/update_checker.rb:53:in `latest_resolvable_version_with_no_unlock'
     # ./spec/dependabot/bundler/update_checker_spec.rb:1451:in `block (3 levels) in <top (required)>'
     # ./spec/dependabot/bundler/update_checker_spec.rb:1466:in `block (5 levels) in <top (required)>'
     # ./spec/spec_helper.rb:54:in `block (2 levels) in <top (required)>'
     # /home/dependabot/dependabot-core/common/spec/spec_helper.rb:49:in `block (2 levels) in <top (required)>'
     # ./.bundle/ruby/2.7.0/gems/webmock-3.14.0/lib/webmock/rspec.rb:37:in `block (2 levels) in <top (required)>'

Finished in 6 minutes 13 seconds (files took 1.4 seconds to load)
753 examples, 1 failure, 18 pending

Failed examples:

rspec ./spec/dependabot/bundler/update_checker_spec.rb:1466 # Dependabot::Bundler::UpdateChecker#latest_resolvable_version_with_no_unlock given a gem from rubygems with a version conflict at the latest version