Bump actions/cache from 3 to 4 (#145)

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>

Author: dependabot[bot]

.github/workflows/rust.yml

@@ -72,7 +72,7 @@ jobs:
         with:
           toolchain: ${{matrix.rust.toolchain}}
         id: rust-toolchain
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: |
             ~/.cargo/git
@@ -134,7 +134,7 @@ jobs:
         with:
           toolchain: ${{matrix.rust.toolchain}}
         id: rust-toolchain
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: |
             ~/.cargo/git
@@ -175,7 +175,7 @@ jobs:
       - name: Get Tarpaulin Version
         id: tarpaulin-version
         run: echo "version=$(wget -qO- 'https://crates.io/api/v1/crates/cargo-tarpaulin' | jq -r '.crate.max_stable_version')" >>$GITHUB_OUTPUT
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: |
             ~/.cargo/bin/cargo-tarpaulin