Remove unnecessary exclusion of node 18 on ubuntu 18.04

Author: jeffsmale90

.github/workflows/pr.yml

@@ -12,13 +12,8 @@ jobs:
       matrix:
         node: [14.0.0]
         os: [windows-2019, ubuntu-18.04, ubuntu-20.04, macos-11]
-        exclude:
-          # Node v18 does not run on ubuntu-18.04: https://github.com/nodejs/node/issues/42351#issuecomment-1068424442
-          - os: ubuntu-18.04
-            node: 18.x
 
     runs-on: ${{ matrix.os }}
-
     steps:
       - name: Cancel Previous Runs
         uses: styfle/[email protected]