ci(check-and-build-and-test): use single quotes per https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/evaluate-expressions-in-workflows-and-actions#literals

.github/workflows/check-and-build-and-test.yml

@@ -229,6 +229,13 @@ jobs:
           shared-key: ${{ matrix.supporteds.target }}-latest-variable
           cache-on-failure: "true"
 
-      - name: Verify MSRV (minimum supported Rust version)
+      - name: Verify declared MSRV (minimum supported Rust version)
+        id: verify
+        continue-on-error: true
         run: cargo msrv verify
         working-directory: ${{ matrix.crate_directory }}
+
+      - name: Report actual MSRV and reason for failing the declared version
+        if: ${{ steps.verify.outcome == 'failure' }}
+        run: cargo msrv find && exit 1
+        working-directory: ${{ matrix.crate_directory }}