Bump actions/cache from 3 to 4

.github/workflows/build-runtime.yaml

@@ -18,7 +18,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Cache runtime target dir
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: "${{ github.workspace }}/runtime/${{ matrix.runtime }}/target"
           key: srtool-target-${{ matrix.runtime }}-${{ github.sha }}

.github/workflows/simulate.yml

@@ -45,7 +45,7 @@ jobs:
           override: true
 
       - name: Cache Build artefacts
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: |
             ~/.cargo/bin/

.github/workflows/try-runtime.yml

@@ -19,7 +19,7 @@ jobs:
         uses: "./.github/templates/setup-worker"
 
       - name: Cache Build artefacts
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         id: cargo-cache
         with:
           path: |