chore: remove Node.js 18 from matrix to fix CI build with stencil-cli (bigcommerce#2563)

Author: bc-yevhenii-buliuk

.github/workflows/pull_request_review.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        node: [18.x, 20.x]
+        node: [20.x]
 
     runs-on: ${{ matrix.os }}