Update check-standard.yaml

Author: bpbond

.github/workflows/check-standard.yaml

@@ -18,9 +18,9 @@ jobs:
       fail-fast: false
       matrix:
         config:
-          - {os: windows-latest, r: '3.1'}
-          - {os: macOS-latest, r: '3.1'}
-          - {os: ubuntu-16.04, r: '3.1', rspm: "https://demo.rstudiopm.com/all/__linux__/xenial/latest"}
+          - {os: windows-latest, r: '4.1'}
+          - {os: macOS-latest, r: '4.1'}
+          - {os: ubuntu-16.04, r: '4.1', rspm: "https://demo.rstudiopm.com/all/__linux__/xenial/latest"}
 
     env:
       R_REMOTES_NO_ERRORS_FROM_WARNINGS: true