Bump actions/cache from 3 to 4 (#641)

Bumps [actions/cache](https://github.com/actions/cache) from 3 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3...v4)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/rust.yml

@@ -21,7 +21,7 @@ jobs:
       - uses: dtolnay/rust-toolchain@stable
         id: rust-toolchain
 
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: |
             ~/.cargo/git
@@ -51,7 +51,7 @@ jobs:
         with:
           toolchain: ${{ matrix.toolchain }}
 
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: |
             ~/.cargo/git
@@ -80,7 +80,7 @@ jobs:
           toolchain: "1.72"
           components: clippy
 
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: |
             ~/.cargo/git
@@ -102,7 +102,7 @@ jobs:
         id: tarpaulin-version
         run: echo "::set-output name=VERSION::$(wget -qO- 'https://crates.io/api/v1/crates/cargo-tarpaulin' | jq -r '.crate.max_stable_version')"
 
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: |
             ~/.cargo/bin/cargo-tarpaulin