Cache installation of cargo-vet

Author: Raniz85

.github/workflows/audits.yml

@@ -11,6 +11,15 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
+      - uses: actions/cache@v3
+        id: cargo-cache
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+          key: ${{ runner.os }}-cargo-vet
 
       - uses: actions-rs/toolchain@v1
         with: