Update actions/cache action to v5

Author: renovate[bot]

.github/workflows/ci.yml

@@ -58,7 +58,7 @@ jobs:
           components: clippy
 
       - name: "Cache cargo registry"
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.cargo/registry
@@ -83,7 +83,7 @@ jobs:
         uses: dtolnay/rust-toolchain@stable
 
       - name: "Cache cargo registry"
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.cargo/registry
@@ -108,7 +108,7 @@ jobs:
         uses: dtolnay/rust-toolchain@stable
 
       - name: "Cache cargo registry"
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.cargo/registry
@@ -133,7 +133,7 @@ jobs:
         uses: dtolnay/rust-toolchain@stable
 
       - name: "Cache cargo registry"
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.cargo/registry