chore(deps): bump DeterminateSystems/magic-nix-cache-action from 8 to 9

Bumps [DeterminateSystems/magic-nix-cache-action](https://github.com/determinatesystems/magic-nix-cache-action) from 8 to 9.
- [Release notes](https://github.com/determinatesystems/magic-nix-cache-action/releases)
- [Commits](DeterminateSystems/magic-nix-cache-action@v8...v9)

---
updated-dependencies:
- dependency-name: DeterminateSystems/magic-nix-cache-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/ci-pre-commit.yaml

@@ -13,7 +13,7 @@ jobs:
     - uses: DeterminateSystems/nix-installer-action@v16
       with:
         diagnostic-endpoint: ""
-    - uses: DeterminateSystems/magic-nix-cache-action@v8
+    - uses: DeterminateSystems/magic-nix-cache-action@v9
       with:
         diagnostic-endpoint: ""
     - name: Checkout

.github/workflows/ci-tests-all.yaml

@@ -25,7 +25,7 @@ jobs:
       with:
         diagnostic-endpoint: ""
 
-    - uses: DeterminateSystems/magic-nix-cache-action@v8
+    - uses: DeterminateSystems/magic-nix-cache-action@v9
       with:
         diagnostic-endpoint: ""