Bump EndBug/add-and-commit from 7 to 9

Bumps [EndBug/add-and-commit](https://github.com/endbug/add-and-commit) from 7 to 9.
- [Release notes](https://github.com/endbug/add-and-commit/releases)
- [Commits](EndBug/add-and-commit@v7...v9)

---
updated-dependencies:
- dependency-name: EndBug/add-and-commit
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/generate.yml

@@ -52,7 +52,7 @@ jobs:
           rsync -rlptD --delete-after work/syntax/ target/syntax
           rsync -rlptD --delete-after work/README-dist.md target/README.md
       - name: Commit updated master branch
-        uses: EndBug/add-and-commit@v7
+        uses: EndBug/add-and-commit@v9
         with:
           cwd: './target'
           default_author: github_actions
@@ -110,7 +110,7 @@ jobs:
           # install
           cp work/target/html/doc/*.html target
       - name: Commit updated master branch
-        uses: EndBug/add-and-commit@v7
+        uses: EndBug/add-and-commit@v9
         with:
           cwd: './target'
           default_author: github_actions