Add write perms to deploy

*
https://github.com/peaceiris/actions-gh-pages?tab=readme-ov-file#%EF%B8%8F-first-deployment-with-github_token

Signed-off-by: Ryan Friedman <[email protected]>

Author: Ryanf55

.github/workflows/doxygen_deploy.yml

@@ -9,6 +9,8 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
+    permissions:
+      contents: write
     steps:
     - uses: ./.github/workflows/doxygen_build.yml
     - uses: peaceiris/actions-gh-pages@v3