build(deps): Bump actions/cache from 5.0.5 to 6.0.0 in the actions group

Bumps the actions group with 1 update: [actions/cache](https://github.com/actions/cache).


Updates `actions/cache` from 5.0.5 to 6.0.0
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@27d5ce7...2c8a9bd)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/elixir-ci.yml

@@ -67,7 +67,7 @@ jobs:
           elixir-version: ${{ matrix.elixir }}
           otp-version: ${{ matrix.otp }}
       - if: steps.detect.outputs.relevant == 'true'
-        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+        uses: actions/cache@2c8a9bd7457de244a408f35966fab2fb45fda9c8 # v6.0.0
         with:
           path: |
             elixir-orchestration/deps
@@ -120,7 +120,7 @@ jobs:
           elixir-version: "1.17"
           otp-version: "27"
       - if: steps.detect.outputs.relevant == 'true'
-        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+        uses: actions/cache@2c8a9bd7457de244a408f35966fab2fb45fda9c8 # v6.0.0
         with:
           path: |
             elixir-orchestration/deps
@@ -171,7 +171,7 @@ jobs:
           elixir-version: "1.17"
           otp-version: "27"
       - if: steps.detect.outputs.relevant == 'true'
-        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+        uses: actions/cache@2c8a9bd7457de244a408f35966fab2fb45fda9c8 # v6.0.0
         with:
           path: |
             elixir-orchestration/deps