Bump actions/cache from 5.0.5 to 6.0.0.

Author: garydgregory

.github/workflows/maven.yml

@@ -44,7 +44,7 @@ jobs:
     - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
       with:
         persist-credentials: false
-    - uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae  #v5.0.5
+    - uses: actions/cache@2c8a9bd7457de244a408f35966fab2fb45fda9c8 # v6.0.0
       with:
         path: ~/.m2/repository
         key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}