github: workflows: bump DeterminateSystems/nix-installer-action

Bumps [DeterminateSystems/nix-installer-action](https://github.com/determinatesystems/nix-installer-action) from 13 to 19.
- [Release notes](https://github.com/determinatesystems/nix-installer-action/releases)
- [Commits](DeterminateSystems/nix-installer-action@v13...v19)

---
updated-dependencies:
- dependency-name: DeterminateSystems/nix-installer-action
  dependency-version: '19'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/docs.yml

@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - uses: DeterminateSystems/nix-installer-action@v13
+      - uses: DeterminateSystems/nix-installer-action@v19
       - uses: DeterminateSystems/magic-nix-cache-action@v7
       - run: nix build .#docs
 

.github/workflows/nix_build_check_without_standalone.yml

@@ -10,6 +10,6 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - uses: DeterminateSystems/nix-installer-action@v13
+      - uses: DeterminateSystems/nix-installer-action@v19
       - uses: DeterminateSystems/magic-nix-cache-action@v7
       - run: nix build .#checkWithoutStandalone

.github/workflows/nix_flake_update.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - uses: DeterminateSystems/nix-installer-action@v13
+      - uses: DeterminateSystems/nix-installer-action@v19
       - uses: DeterminateSystems/magic-nix-cache-action@v7
 
       - uses: DeterminateSystems/update-flake-lock@v23