GHA: check on R-devel Windows as well

Because it is failing in pak. Also on R-next.

Author: gaborcsardi

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

@@ -27,6 +27,8 @@ jobs:
           - {os: macos-latest,   r: 'devel'}
           - {os: macos-latest,   r: 'release'}
 
+          - {os: windows-latest, r: 'devel'}
+          - {os: windows-latest, r: 'next'}
           - {os: windows-latest, r: 'release'}
           # use 4.0 or 4.1 to check with rtools40's older compiler
           - {os: windows-latest, r: 'oldrel-4'}