Bump actions/cache from 1 to 4

Bumps [actions/cache](https://github.com/actions/cache) from 1 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v1...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>

.github/workflows/ci.yml

@@ -38,7 +38,7 @@ jobs:
         if: matrix.os == 'ubuntu-latest'
         run: sudo chown -R $(whoami):$(id -ng) ~/.cargo/
       - name: Cache cargo
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         id: cache
         with:
           path: ~/.cargo
@@ -68,7 +68,7 @@ jobs:
         if: matrix.os == 'ubuntu-latest'
         run: sudo chown -R $(whoami):$(id -ng) ~/.cargo/
       - name: Cache cargo
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         id: cache
         with:
           path: ~/.cargo
@@ -109,7 +109,7 @@ jobs:
           override: true
           components: clippy
       - name: Cache cargo
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         id: cache
         with:
           path: ~/.cargo
@@ -130,7 +130,7 @@ jobs:
           toolchain: nightly
           override: true
       - name: Cache cargo
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         id: cache
         with:
           path: ~/.cargo