build(deps): Bump DeterminateSystems/nix-installer-action from 19 to 20

Bumps [DeterminateSystems/nix-installer-action](https://github.com/determinatesystems/nix-installer-action) from 19 to 20.
- [Release notes](https://github.com/determinatesystems/nix-installer-action/releases)
- [Commits](DeterminateSystems/nix-installer-action@v19...v20)

---
updated-dependencies:
- dependency-name: DeterminateSystems/nix-installer-action
  dependency-version: '20'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/e2e.yml

@@ -40,7 +40,7 @@ jobs:
           fetch-depth: 0
 
       - name: Install Nix on self-hosted ARC runners
-        uses: DeterminateSystems/nix-installer-action@v19
+        uses: DeterminateSystems/nix-installer-action@v20
         if: inputs.runs-on == 'self-hosted-ncn-dind'
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}