Bump mattnotmitt/doxygen-action from 1.9.2 to 1.9.8

Bumps [mattnotmitt/doxygen-action](https://github.com/mattnotmitt/doxygen-action) from 1.9.2 to 1.9.8.
- [Release notes](https://github.com/mattnotmitt/doxygen-action/releases)
- [Commits](mattnotmitt/doxygen-action@v1.9.2...v1.9.8)

---
updated-dependencies:
- dependency-name: mattnotmitt/doxygen-action
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/doxygen.yml

@@ -11,7 +11,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - uses: mattnotmitt/doxygen-action@v1.9.2
+      - uses: mattnotmitt/doxygen-action@v1.9.8
         with:
           working-directory: 'enzyme/'
           doxyfile-path: 'doxygen.cfg'