Fixed missing maven 3.9.6 versions

.github/workflows/release.yml

@@ -5,6 +5,7 @@ on:
     types: [ closed ]
     paths:
       - '.github/project.yml'
+      - '.github/workflows/release.yml'
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
@@ -42,6 +43,11 @@ jobs:
           gpg-private-key: ${{ secrets.GPG_PRIVATE_KEY }}
           gpg-passphrase: MAVEN_GPG_PASSPHRASE
 
+      - name: Set up Maven 3.9.6
+        uses: stCarolas/setup-maven@v5
+        with:
+          maven-version: 3.9.6
+
       - name: Configure Git author
         run: |
           git config --local user.email "[email protected]"