chore(deps): bump cachix/install-nix-action from 25 to 26

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 25 to 26.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](cachix/install-nix-action@v25...v26)

---
updated-dependencies:
- dependency-name: cachix/install-nix-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/build.yaml

@@ -9,15 +9,15 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v25
+      - uses: cachix/install-nix-action@v26
       - uses: DeterminateSystems/magic-nix-cache-action@v4
       - name: Check flake
         run: nix flake check
   format:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v25
+      - uses: cachix/install-nix-action@v26
       - uses: DeterminateSystems/magic-nix-cache-action@v4
       - name: Check format
         run: |
@@ -27,7 +27,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v25
+      - uses: cachix/install-nix-action@v26
       - uses: DeterminateSystems/magic-nix-cache-action@v4
       - name: Build Home Manager configuration
         run: |
@@ -37,15 +37,15 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v25
+      - uses: cachix/install-nix-action@v26
       - uses: DeterminateSystems/magic-nix-cache-action@v4
       - name: Build NixOS configuration
         run: nix run '.#os' -- build -L --flake '.#ci' --print-build-logs
   nix-darwin-amd64:
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v25
+      - uses: cachix/install-nix-action@v26
       - uses: DeterminateSystems/magic-nix-cache-action@v4
       - name: Build nix-darwin configuration
         run: nix run '.#os' -- build -L --flake '.#ci-amd64' --print-build-logs

.github/workflows/upgrade-deps.yaml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v25
+      - uses: cachix/install-nix-action@v26
       - name: Update dependencies
         run: nix run '.#update'
       - name: Create Pull Request