ci/github-script/labels: set maintainer labels from latest maintainer map

Instead of setting the maintainer-related labels based entirely on Eval
results, this uses the new maintainer map from the target branch. This
allows labeling PRs correctly, that had been created *before* a
contributor became a maintainer of the respective package.

.github/workflows/eval.yml

@@ -202,7 +202,6 @@ jobs:
 
       - name: Compare against the target branch
         env:
-          AUTHOR_ID: ${{ github.event.pull_request.user.id }}
           TARGET_SHA: ${{ inputs.mergedSha }}
         run: |
           git -C nixpkgs/trusted diff --name-only "$TARGET_SHA" \
@@ -212,7 +211,6 @@ jobs:
           nix-build nixpkgs/trusted/ci --arg nixpkgs ./nixpkgs/trusted-pinned -A eval.compare \
             --arg combinedDir ./combined \
             --arg touchedFilesJson ./touched-files.json \
-            --argstr githubAuthorId "$AUTHOR_ID" \
             --out-link comparison
 
           cat comparison/step-summary.md >> "$GITHUB_STEP_SUMMARY"

.github/workflows/labels.yml

@@ -39,10 +39,6 @@ jobs:
   update:
     runs-on: ubuntu-24.04-arm
     if: github.event_name != 'schedule' || github.repository_owner == 'NixOS'
-    env:
-      # TODO: Remove after 2026-03-04, when Node 24 becomes the default.
-      # https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/
-      FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: "true"
     steps:
       - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         with: