fix(ci): Unlink python before brew install (#18402)

* fix(ci): Unlink python before `brew install`

Otherwise it fails to update Python with:

```
==> Upgrading [email protected]
  3.11.4_1 -> 3.11.5

==> Pouring [email protected]
Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink bin/2to3
Target /usr/local/bin/2to3
already exists. You may want to remove it:
  rm '/usr/local/bin/2to3'

To force the link and overwrite all conflicting files:
  brew link --overwrite [email protected]

To list all files that would be deleted:
  brew link --overwrite --dry-run [email protected]
```

Example: https://github.com/vectordotdev/vector/actions/runs/5995416388/job/16258473755

Signed-off-by: Jesse Szwedko <[email protected]>

* shell lint

Signed-off-by: Jesse Szwedko <[email protected]>

---------

Signed-off-by: Jesse Szwedko <[email protected]>

Author: jszwedko

scripts/environment/bootstrap-macos-10.sh

@@ -6,6 +6,10 @@ unset HOMEBREW_NO_INSTALL_FROM_API
 
 brew update
 
+# `brew install` attempts to upgrade python as a dependency but fails
+# https://github.com/actions/setup-python/issues/577
+brew list -1 | grep python | while read -r formula; do brew unlink "$formula"; brew link --overwrite "$formula"; done
+
 brew install [email protected] coreutils cue-lang/tap/cue protobuf
 
 gem install bundler