ci: use actions/setup-node@v2 and remove merge.yml as it has not been used since the switch from master to main (#644)

Author: gr2m

.github/workflows/merge.yml

@@ -7,14 +7,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-node@v1
+      - uses: actions/setup-node@v2
       - run: npm ci
       - run: npm run build
   lint:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-node@v1
+      - uses: actions/setup-node@v2
       - run: npm ci
       - run: npm run lint
   test:
@@ -24,7 +24,7 @@ jobs:
         node-version: [12.x, 14.x, 16.x]
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-node@v1
+      - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node-version }}
       - run: npm ci
@@ -33,6 +33,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-node@v1
+      - uses: actions/setup-node@v2
       - run: npm ci
       - run: npm run typecheck