build(deps): bump cachix/cachix-action from 12 to 13 (#272012)

Bumps [cachix/cachix-action](https://github.com/cachix/cachix-action) from 12 to 13.
- [Release notes](https://github.com/cachix/cachix-action/releases)
- [Commits](6a9a34cdd9...6a2e08b5eb)

---
updated-dependencies:
- dependency-name: cachix/cachix-action
  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>

.github/workflows/basic-eval.yml

@@ -20,7 +20,7 @@ jobs:
     steps:
     - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
     - uses: cachix/install-nix-action@7ac1ec25491415c381d9b62f0657c7a028df52a7 # v24
-    - uses: cachix/cachix-action@6a9a34cdd93d0ae4b4b59fd678660efb08109f2f # v13
+    - uses: cachix/cachix-action@6a2e08b5ebf7a9f285ff57b1870a4262b06e0bee # v13
       with:
         # This cache is for the nixpkgs repo checks and should not be trusted or used elsewhere.
         name: nixpkgs-ci

.github/workflows/manual-nixos.yml

@@ -22,7 +22,7 @@ jobs:
         with:
           # explicitly enable sandbox
           extra_nix_config: sandbox = true
-      - uses: cachix/cachix-action@6a9a34cdd93d0ae4b4b59fd678660efb08109f2f # v13
+      - uses: cachix/cachix-action@6a2e08b5ebf7a9f285ff57b1870a4262b06e0bee # v13
         with:
           # This cache is for the nixpkgs repo checks and should not be trusted or used elsewhere.
           name: nixpkgs-ci

.github/workflows/manual-nixpkgs.yml

@@ -23,7 +23,7 @@ jobs:
         with:
           # explicitly enable sandbox
           extra_nix_config: sandbox = true
-      - uses: cachix/cachix-action@6a9a34cdd93d0ae4b4b59fd678660efb08109f2f # v13
+      - uses: cachix/cachix-action@6a2e08b5ebf7a9f285ff57b1870a4262b06e0bee # v13
         with:
           # This cache is for the nixpkgs repo checks and should not be trusted or used elsewhere.
           name: nixpkgs-ci