Fix CI cache (#396)

Trying to fix the broken CI cache. The old cache/save version complained
that the cache was locked. No idea why. The action was used as
documented.

Moving the checkout action to the first step to align with
documentation. And updating the action to the most recent version.

Author: parasyte

.github/workflows/rust.yml

@@ -22,8 +22,9 @@ jobs:
         task: [build, lint, fmt, test, docs, coverage, deny, insta, shear, vet]
     name: ${{ matrix.task }}
     steps:
-      - uses: actions/cache/restore@5a3ec84eff668545956fd18022155c47e93e2684 # v4
-        id: cache
+      - uses: actions/checkout@0c366fd6a839edf440554fa01a7085ccba70ac98 # v6
+      - uses: actions/cache/restore@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5
+        id: restore-cache
         with:
           path: |
             ~/.rustup
@@ -32,7 +33,6 @@ jobs:
             ~/.cargo/.crates2.json
           key: toolchain-${{ matrix.task }}
       - uses: extractions/setup-just@e33e0265a09d6d736e2ee1e0eb685ef1de4669ff # v2
-      - uses: actions/checkout@09d2acae674a48949e3602304ab46fd20ae0c42f # v4
       - uses: Swatinem/rust-cache@7e1e2d0a10862b34e5df481373b2b0f295d1a2ef # v2
         with:
           key: ${{ matrix.task }}
@@ -46,11 +46,11 @@ jobs:
           file: lcov.info
           fail-on-error: false
       - if: ${{ github.ref == 'refs/heads/main' }}
-        uses: actions/cache/save@5a3ec84eff668545956fd18022155c47e93e2684 # v4
+        uses: actions/cache/save@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5
         with:
           path: |
             ~/.rustup
             ~/.cargo/bin/
             ~/.cargo/.crates.toml
             ~/.cargo/.crates2.json
-          key: ${{ steps.cache.outputs.cache-primary-key }}
+          key: ${{ steps.restore-cache.outputs.cache-primary-key }}