Update Swatinem/rust-cache action to v2.7.7 (#7621)

Author: oxide-renovate[bot]

.github/workflows/rust.yml

@@ -40,7 +40,7 @@ jobs:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       with:
         ref: ${{ github.event.pull_request.head.sha }} # see omicron#4461
-    - uses: Swatinem/rust-cache@82a92a6e8fbeee089604da2575dc567ae9ddeaab # v2.7.5
+    - uses: Swatinem/rust-cache@f0deed1e0edfc6a9be95417288c0e1099b1eeec3 # v2.7.7
       if: ${{ github.ref != 'refs/heads/main' }}
     - name: Report cargo version
       run: cargo --version
@@ -70,7 +70,7 @@ jobs:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       with:
         ref: ${{ github.event.pull_request.head.sha }} # see omicron#4461
-    - uses: Swatinem/rust-cache@82a92a6e8fbeee089604da2575dc567ae9ddeaab # v2.7.5
+    - uses: Swatinem/rust-cache@f0deed1e0edfc6a9be95417288c0e1099b1eeec3 # v2.7.7
       if: ${{ github.ref != 'refs/heads/main' }}
     - name: Report cargo version
       run: cargo --version
@@ -98,7 +98,7 @@ jobs:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       with:
         ref: ${{ github.event.pull_request.head.sha }} # see omicron#4461
-    - uses: Swatinem/rust-cache@82a92a6e8fbeee089604da2575dc567ae9ddeaab # v2.7.5
+    - uses: Swatinem/rust-cache@f0deed1e0edfc6a9be95417288c0e1099b1eeec3 # v2.7.7
       if: ${{ github.ref != 'refs/heads/main' }}
     - name: Report cargo version
       run: cargo --version
@@ -130,7 +130,7 @@ jobs:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       with:
         ref: ${{ github.event.pull_request.head.sha }} # see omicron#4461
-    - uses: Swatinem/rust-cache@82a92a6e8fbeee089604da2575dc567ae9ddeaab # v2.7.5
+    - uses: Swatinem/rust-cache@f0deed1e0edfc6a9be95417288c0e1099b1eeec3 # v2.7.7
       if: ${{ github.ref != 'refs/heads/main' }}
     - name: Report cargo version
       run: cargo --version