Update Swatinem/rust-cache action to v2.7.7

Author: renovate[bot]

.github/workflows/rust.yml

@@ -24,7 +24,7 @@ jobs:
           components: clippy, rustfmt
 
       - name: cache dependencies
-        uses: Swatinem/rust-cache@v2.5.1
+        uses: Swatinem/rust-cache@v2.7.7
 
       - name: reviewdog / clippy
         uses: sksat/action-clippy@v0.2.1