bump node version in nvmrc, bump dev dependencies

Author: lisicky

.github/workflows/pr-checks.yml

@@ -14,7 +14,7 @@ jobs:
           submodules: 'recursive'
       - uses: actions/setup-node@v1
         with:
-          node-version: '12.18.1'
+          node-version: '18'
       - name: Cache node modules
         uses: actions/cache@v1
         with:
@@ -50,7 +50,7 @@ jobs:
           submodules: 'recursive'
       - uses: actions/setup-node@v1
         with:
-          node-version: '12.18.1'
+          node-version: '18'
       - name: Cache node modules
         uses: actions/cache@v1
         with:

.nvmrc

@@ -1 +1 @@
-v12.18.1
+v18