ci(deps): bump Swatinem/rust-cache from 2.8.2 to 2.9.1 (#53)

Bumps [Swatinem/rust-cache](https://github.com/swatinem/rust-cache) from 2.8.2 to 2.9.1.
- [Release notes](https://github.com/swatinem/rust-cache/releases)
- [Changelog](https://github.com/Swatinem/rust-cache/blob/master/CHANGELOG.md)
- [Commits](Swatinem/rust-cache@779680d...c193711)

---
updated-dependencies:
- dependency-name: Swatinem/rust-cache
  dependency-version: 2.9.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/rust-ci.yml

@@ -32,7 +32,7 @@ jobs:
       - uses: dtolnay/rust-toolchain@4be9e76fd7c4901c61fb841f559994984270fce7 # stable
         with:
           components: rustfmt, clippy
-      - uses: Swatinem/rust-cache@779680da715d629ac1d338a641029a2f4372abb5 # v2
+      - uses: Swatinem/rust-cache@c19371144df3bb44fab255c43d04cbc2ab54d1c4 # v2
         with:
           workspaces: ${{ matrix.crate }}
 
@@ -60,7 +60,7 @@ jobs:
       - uses: dtolnay/rust-toolchain@4be9e76fd7c4901c61fb841f559994984270fce7 # stable
         with:
           targets: wasm32-unknown-unknown
-      - uses: Swatinem/rust-cache@779680da715d629ac1d338a641029a2f4372abb5 # v2
+      - uses: Swatinem/rust-cache@c19371144df3bb44fab255c43d04cbc2ab54d1c4 # v2
         with:
           workspaces: vault-worker