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] <[email protected]>

.github/workflows/maven-matrix.yml

@@ -102,7 +102,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Import GPG key to sign maven build artifacts
-        uses: crazy-max/ghaction-import-gpg@v5
+        uses: crazy-max/ghaction-import-gpg@v6
         with:
           gpg_private_key: ${{ secrets.GPG_SECRET_KEYS }}
           passphrase: ${{ secrets.GPG_PASSPHRASE }}
@@ -133,7 +133,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Import GPG key to sign maven build artifacts
-        uses: crazy-max/ghaction-import-gpg@v5
+        uses: crazy-max/ghaction-import-gpg@v6
         with:
           gpg_private_key: ${{ secrets.GPG_SECRET_KEYS }}
           passphrase: ${{ secrets.GPG_PASSPHRASE }}