Update Swatinem/rust-cache action to v2.7.7

Author: renovate[bot]

.github/workflows/pytest.yml

@@ -74,7 +74,7 @@ jobs:
         components: clippy, rustfmt
 
     - name: cache Rust dependencies
-      uses: Swatinem/rust-cache@v2.7.5
+      uses: Swatinem/rust-cache@v2.7.7
 
     - name: Install Protoc
       uses: arduino/setup-protoc@v1

.github/workflows/rust.yml

@@ -31,7 +31,7 @@ jobs:
           components: clippy, rustfmt
 
       - name: cache dependencies
-        uses: Swatinem/rust-cache@v2.7.5
+        uses: Swatinem/rust-cache@v2.7.7
 
       - name: setup c2a-core
         run: ./setup.sh