Comment out oldrel-1 R version for Ubuntu

Comment out the oldrel-1 R version for Ubuntu in the workflow.

Author: smasongarrison

.github/workflows/R-CMD-devcheck.yaml

@@ -24,7 +24,7 @@ jobs:
           - {os: windows-latest, r: 'release', rtools: '42'}
           - {os: ubuntu-latest, r: 'devel', rtools: '', http-user-agent: 'release'}
           - {os: ubuntu-latest, r: 'release', rtools: ''}
-          - {os: ubuntu-latest, r: 'oldrel-1', rtools: ''}
+    #      - {os: ubuntu-latest, r: 'oldrel-1', rtools: ''}
 
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}