Bump crazy-max/ghaction-import-gpg from 5 to 6

Bumps [crazy-max/ghaction-import-gpg](https://github.com/crazy-max/ghaction-import-gpg) from 5 to 6.
- [Release notes](https://github.com/crazy-max/ghaction-import-gpg/releases)
- [Commits](crazy-max/ghaction-import-gpg@v5...v6)

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

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

.github/workflows/release.yml

@@ -72,7 +72,7 @@ jobs:
 
       - name: Import gpg key (release only)
         id: gpg
-        uses: crazy-max/ghaction-import-gpg@v5
+        uses: crazy-max/ghaction-import-gpg@v6
         if: |
           github.event_name != 'release'
           && github.ref == 'refs/heads/master'