Bump actions/cache from 4 to 5 (#1702)

Author: dhardy

.github/workflows/test.yml

@@ -133,7 +133,7 @@ jobs:
           target: ${{ matrix.target }}
           toolchain: ${{ matrix.toolchain }}
       - name: Cache cargo plugins
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ~/.cargo/bin/
           key: ${{ runner.os }}-cargo-plugins