chore(deps): update swatinem/rust-cache digest to 720f7e4 (#74)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
           override: true
           profile: minimal
           components: clippy, rustfmt
-      - uses: Swatinem/rust-cache@82a92a6e8fbeee089604da2575dc567ae9ddeaab # v2
+      - uses: Swatinem/rust-cache@720f7e45ccee46c12a7b1d7bed2ab733be9be5a1 # v2
         with:
           key: ${{ matrix.pwd }}
           workspaces: ${{ matrix.pwd }}
@@ -47,7 +47,7 @@ jobs:
           toolchain: stable
           override: true
           profile: minimal
-      - uses: Swatinem/rust-cache@82a92a6e8fbeee089604da2575dc567ae9ddeaab # v2
+      - uses: Swatinem/rust-cache@720f7e45ccee46c12a7b1d7bed2ab733be9be5a1 # v2
       - name: Check documentation
         env:
           RUSTDOCFLAGS: "-D rustdoc::broken_intra_doc_links"
@@ -63,7 +63,7 @@ jobs:
           toolchain: stable
           override: true
           profile: minimal
-      - uses: Swatinem/rust-cache@82a92a6e8fbeee089604da2575dc567ae9ddeaab # v2
+      - uses: Swatinem/rust-cache@720f7e45ccee46c12a7b1d7bed2ab733be9be5a1 # v2
       - name: Run doc tests
         uses: actions-rs/cargo@844f36862e911db73fe0815f00a4a2602c279505 # v1
         with:
@@ -94,7 +94,7 @@ jobs:
           toolchain: stable
           override: true
           profile: minimal
-      - uses: Swatinem/rust-cache@82a92a6e8fbeee089604da2575dc567ae9ddeaab # v2
+      - uses: Swatinem/rust-cache@720f7e45ccee46c12a7b1d7bed2ab733be9be5a1 # v2
         with:
           key: ${{ matrix.pwd }}
           workspaces: ${{ matrix.pwd }}