build(deps): bump the actions group with 2 updates

Bumps the actions group with 2 updates: [DeterminateSystems/nix-installer-action](https://github.com/determinatesystems/nix-installer-action) and [DeterminateSystems/update-flake-lock](https://github.com/determinatesystems/update-flake-lock).


Updates `DeterminateSystems/nix-installer-action` from 13 to 14
- [Release notes](https://github.com/determinatesystems/nix-installer-action/releases)
- [Commits](DeterminateSystems/nix-installer-action@v13...v14)

Updates `DeterminateSystems/update-flake-lock` from 23 to 24
- [Release notes](https://github.com/determinatesystems/update-flake-lock/releases)
- [Commits](DeterminateSystems/update-flake-lock@v23...v24)

---
updated-dependencies:
- dependency-name: DeterminateSystems/nix-installer-action
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: DeterminateSystems/update-flake-lock
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
...

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

.github/workflows/flake_update.yml

@@ -18,9 +18,9 @@ jobs:
         with:
           submodules: true
       - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v13
+        uses: DeterminateSystems/nix-installer-action@v14
       - name: Update flake.lock
-        uses: DeterminateSystems/update-flake-lock@v23
+        uses: DeterminateSystems/update-flake-lock@v24
         with:
           pr-title: "Update flake.lock"
           pr-labels: |