chore(actions): update actions/cache action to v5

Author: renovate[bot]

.github/workflows/merge-master.yaml

@@ -62,7 +62,7 @@ jobs:
         go-version-file: 'go.mod'
 
     - name: Cache Go modules
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: |
           ~/.cache/go-build

.github/workflows/pull-request.yaml

@@ -42,7 +42,7 @@ jobs:
         go-version-file: 'go.mod'
 
     - name: Cache Go modules
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: |
           ~/.cache/go-build