fix(ci): remove actions/setup-node from lint job to bypass corrupted runner cache

Runner pod gitea-act-runner-cartsnitch-85b5984bb-527xw has a corrupt
/root/.cache/act clone of actions/setup-node (missing dist/setup/index.js).
SHA-pinning changed the cache hash but the fresh clone on that pod still
ends up missing the dist directory.

catthehacker/ubuntu:act-latest ships Node pre-installed; the lint job only
needs ESLint + tsc, both of which are devDependencies installed by npm ci.
Removing actions/setup-node from lint bypasses the corrupt pod cache entirely
without affecting other jobs.

Refs CAR-1162

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.gitea/workflows/ci.yml

@@ -27,10 +27,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5
-      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020
-        with:
-          node-version: "20"
-          cache: npm
       - run: npm ci
       - name: ESLint
         run: npx eslint .