chore(ci): cargo-hack --no-dev-deps

One thing to note is that the use of the --all-targets flag (that builds
tests/examples) needed to be removed and the --no-dev-deps flag is needed.
This is because the dev-dependencies use versionless manifests that cannot
be read by the old compiler.

That said, we are not running tests with the old compiler, so I don't see
a problem if the test suite cannot be built on the old compiler.

Co-authored-by: Taiki Endo <[email protected]>

.github/workflows/main.yml

@@ -258,4 +258,4 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - uses: taiki-e/install-action@cargo-hack
-    - run: cargo hack check --all-targets --rust-version --workspace --no-private
+    - run: cargo hack check --rust-version --workspace --no-private --no-dev-deps