chore(deps): bump actions/cache from 4 to 6 (#208)

Bumps [actions/cache](https://github.com/actions/cache) from 4 to 6.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v4...v6)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '6'
  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/benchmark.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
       - name: Cache cargo registry
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: |
             ~/.cargo/registry

.github/workflows/ci.yml

@@ -37,7 +37,7 @@ jobs:
           sudo apt-get install -y pkg-config libmysqlclient-dev libpq-dev libsqlite3-dev
 
       - name: Cache cargo registry
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: |
             ~/.cargo/registry
@@ -81,7 +81,7 @@ jobs:
           sudo apt-get install -y pkg-config libmysqlclient-dev libpq-dev libsqlite3-dev
 
       - name: Cache cargo registry
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: |
             ~/.cargo/registry
@@ -119,7 +119,7 @@ jobs:
           sudo apt-get install -y pkg-config libmysqlclient-dev libpq-dev libsqlite3-dev
 
       - name: Cache cargo registry
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: |
             ~/.cargo/registry
@@ -160,7 +160,7 @@ jobs:
           sudo apt-get install -y pkg-config libmysqlclient-dev libpq-dev libsqlite3-dev
 
       - name: Cache cargo registry
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: |
             ~/.cargo/registry
@@ -198,7 +198,7 @@ jobs:
           sudo apt-get install -y pkg-config libmysqlclient-dev libpq-dev libsqlite3-dev
 
       - name: Cache cargo registry
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: |
             ~/.cargo/registry

.github/workflows/publish.yml

@@ -34,7 +34,7 @@ jobs:
           sudo apt-get install -y pkg-config libmariadb-dev libmariadb-dev-compat libpq-dev libsqlite3-dev
 
       - name: Cache cargo registry
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: |
             ~/.cargo/registry