ci: add releaserc and set node version to 20

.github/workflows/pr.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [ 18, 20 ]
+        node: [ 20 ]
 
     name: Node ${{ matrix.node }} PR
     steps:

.github/workflows/release.yml

@@ -39,7 +39,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v3
         with:
-           node-version: 18
+           node-version: 20
            cache: 'pnpm'
       
       - name: Set up QEMU