fix: use maintained Gradle wrapper validation action

Agent-Logs-Url: https://github.com/getyourguide/openapi-validation-java/sessions/91f3a4b3-f144-401b-8563-8d3942f7cc62

Co-authored-by: catarina-correia <93409185+catarina-correia@users.noreply.github.com>

Author: Copilot

.github/workflows/check.yml

@@ -17,14 +17,14 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Set up JDK
         uses: actions/setup-java@f2beeb24e141e01a676f977032f5a29d81c9e27e # v5.1.0
         with:
           distribution: temurin
           java-version-file: .sdkmanrc
       - name: Validate Gradle wrapper
-        uses: gradle/wrapper-validation-action@8d49e559aae34d3e0eb16cde532684bc9702762b # v1.0.6
+        uses: gradle/actions/wrapper-validation@50e97c2cd7a37755bbfafc9c5b7cafaece252f6e # v6.1.0
       - name: Checkstyle
         uses: gradle/gradle-build-action@a8f75513eafdebd8141bd1cd4e30fcd194af8dfa # v2.12.0
         with: