ci: remove unnecessary weekly cache rotation

rust-cache already includes Cargo.lock hash in cache key

Author: xdustinface

.github/workflows/build-and-test.yml

@@ -22,13 +22,9 @@ jobs:
         run: Set-MpPreference -DisableRealtimeMonitoring $true
         shell: pwsh
       - uses: dtolnay/rust-toolchain@stable
-      - name: Get cache week
-        id: cache-week
-        run: echo "week=$(date +%Y-%W)" >> $GITHUB_OUTPUT
-        shell: bash
       - uses: Swatinem/rust-cache@v2
         with:
-          shared-key: "${{ steps.cache-week.outputs.week }}-${{ inputs.os }}"
+          shared-key: "${{ inputs.os }}"
           cache-on-failure: true
       - name: Build workspace (including test binaries)
         run: cargo test --workspace --all-features --no-run ${{ inputs.exclude-crates && format('--exclude {0}', inputs.exclude-crates) || '' }}
@@ -48,13 +44,9 @@ jobs:
         run: Set-MpPreference -DisableRealtimeMonitoring $true
         shell: pwsh
       - uses: dtolnay/rust-toolchain@stable
-      - name: Get cache week
-        id: cache-week
-        run: echo "week=$(date +%Y-%W)" >> $GITHUB_OUTPUT
-        shell: bash
       - uses: Swatinem/rust-cache@v2
         with:
-          shared-key: "${{ steps.cache-week.outputs.week }}-${{ inputs.os }}"
+          shared-key: "${{ inputs.os }}"
           save-if: false
       - uses: actions/setup-python@v5
         with: