ci: update actions/checkout and actions/cache to v4

.github/workflows/benchmarks.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Install Rust
         uses: actions-rs/toolchain@v1
@@ -21,7 +21,7 @@ jobs:
           toolchain: stable
           override: true
 
-      - uses: actions/cache@v2
+      - uses: actions/cache@v4
         with:
           path: |
             ~/.cargo/registry
@@ -94,7 +94,7 @@ jobs:
 
       # Download previous benchmark result from cache (if exists)
       - name: Download previous benchmark data
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         with:
           path: ./cache
           key: ${{ runner.os }}-benchmark

.github/workflows/sync-snarkvm-documentation.yml

@@ -12,7 +12,7 @@ jobs:
   sync:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Fetch branch name
         run: echo Running on branch ${GITHUB_REF#refs/heads/}

.github/workflows/sync-snarkvm-to-welcome-documentation.yml

@@ -12,7 +12,7 @@ jobs:
   sync:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Fetch branch name
         run: echo Running on branch ${GITHUB_REF#refs/heads/}