build(deps): bump crazy-max/ghaction-import-gpg from 6.2.0 to 6.3.0

Bumps [crazy-max/ghaction-import-gpg](https://github.com/crazy-max/ghaction-import-gpg) from 6.2.0 to 6.3.0.
- [Release notes](https://github.com/crazy-max/ghaction-import-gpg/releases)
- [Commits](crazy-max/ghaction-import-gpg@v6.2.0...e89d409)

---
updated-dependencies:
- dependency-name: crazy-max/ghaction-import-gpg
  dependency-version: 6.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/generate_monthly_changelog.yml

@@ -106,7 +106,7 @@ jobs:
       # Import GPG key to sign commits:
       - name: 'Import GPG key to sign commits'
         # Pin action to full length commit SHA
-        uses: crazy-max/ghaction-import-gpg@cb9bde2e2525e640591a934b1fd28eef1dcaf5e5 # v6.2.0
+        uses: crazy-max/ghaction-import-gpg@e89d40939c28e39f97cf32126055eeae86ba74ec # v6.3.0
         with:
           gpg_private_key: ${{ secrets.STDLIB_BOT_GPG_PRIVATE_KEY }}
           passphrase: ${{ secrets.STDLIB_BOT_GPG_PASSPHRASE }}