Bump cachix/install-nix-action from 18 to 19 (#261)

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 18 to 19.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](cachix/install-nix-action@v18...v19)

---
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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/build-and-test.yml

@@ -23,7 +23,7 @@ jobs:
  uses: actions/[email protected]
 
  - name: Install Nix
- uses: cachix/install-nix-action@v18
+ uses: cachix/install-nix-action@v19
  with:
  extra_nix_config: |
  ## Access token to avoid triggering GitHub's rate limiting.
@@ -52,7 +52,7 @@ jobs:
  uses: actions/[email protected]
 
  - name: Install Nix
- uses: cachix/install-nix-action@v18
+ uses: cachix/install-nix-action@v19
  with:
  extra_nix_config: |
  ## Access token to avoid triggering GitHub's rate limiting.
@@ -84,7 +84,7 @@ jobs:
  uses: actions/[email protected]
 
  - name: Install Nix
- uses: cachix/install-nix-action@v18
+ uses: cachix/install-nix-action@v19
  with:
  extra_nix_config: |
  ## Access token to avoid triggering GitHub's rate limiting.
@@ -214,7 +214,7 @@ jobs:
  uses: actions/[email protected]
 
  - name: Install Nix
- uses: cachix/install-nix-action@v18
+ uses: cachix/install-nix-action@v19
  with:
  extra_nix_config: |
  ## Access token to avoid triggering GitHub's rate limiting.

.github/workflows/deploy.yml

@@ -25,7 +25,7 @@ jobs:
  uses: actions/[email protected]
 
  - name: Install Nix
- uses: cachix/install-nix-action@v18
+ uses: cachix/install-nix-action@v19
  with:
  extra_nix_config: |
  ## Access token to avoid triggering GitHub's rate limiting.