GitHub CI: fix and re-enable macOS tests with python 3.13

Fix the `Failed to load shared library 'libglib-2.0.0.dylib' referenced
by the typelib` error by adding the common Homebrew's shared library
directory (i.e., `$(brew --prefix)/lib`) to the dyld library search path.
This ensures that all Homebrew-installed shared libraries are discoverable
via `dlopen()`-like loading mechanism. (Previously, only directory
with `libhidapi` shared library was explicitly added to search path).

Use `DYLD_FALLBACK_LIBRARY_PATH` instead of `DYLD_LIBRARY_PATH` to
register the Homebrew library directory as a fallback search path
rather than preferred/default one. In general, this should be
preferred way of modifying library search path with 3rd-party
installations, even though it probably bears no real difference in
this particular scenario.

.github/workflows/tests.yml

@@ -54,7 +54,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: [3.8]
+        python-version: [3.8, 3.13]
       fail-fast: false
 
     steps:
@@ -69,12 +69,15 @@ jobs:
     - name: Set up macOS dependencies
       run: |
         make install_brew
+    - name: Add Homebrew's library directory to dyld search path
+      run: |
+        echo "DYLD_FALLBACK_LIBRARY_PATH=$(brew --prefix)/lib:$DYLD_FALLBACK_LIBRARY_PATH" >> $GITHUB_ENV
     - name: Install Python dependencies
       run: |
         make install_pip PIP_ARGS='.["test"]'
     - name: Run tests on macOS
       run: |
-        export DYLD_LIBRARY_PATH=$(brew --prefix hidapi)/lib:$DYLD_LIBRARY_PATH && pytest --cov --cov-report=xml
+        pytest --cov --cov-report=xml
     - name: Upload coverage to Codecov
       if: github.ref == 'refs/heads/master'
       uses: codecov/codecov-action@v4.5.0