Unify action versions

Author: captbaritone

.github/workflows/ci.yml

@@ -58,12 +58,10 @@ jobs:
     if: github.event_name == 'push' && github.repository == 'captbaritone/webamp'
     needs: [build-and-test]
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-node@v2
+      - uses: actions/checkout@v1
+      - uses: actions/setup-node@v1
         with:
           node-version: 20.x
-          registry-url: https://registry.npmjs.org/
-          cache: "yarn"
       - name: Install dependencies
         run: yarn install --frozen-lockfile --ignore-scripts
       - name: Build latest (master) version