adding oldrel workflow

Author: donyunardi

.github/workflows/scheduled.yaml

@@ -68,9 +68,12 @@ jobs:
     uses: insightsengineering/r.pkg.template/.github/workflows/rhub.yaml@main
     with:
       config: >-
-        r-devel-windows-x86_64,
         r-patched-linux-x86_64,
         r-release-linux-x86_64,
+        r-devel-windows-x86_64,
         r-release-macos-arm64,
         r-release-macos-x86_64,
-        r-release-windows-x86_64
+        r-release-windows-x86_64,
+        r-oldrel-macos-arm64,
+        r-oldrel-macos-x86_64,
+        r-oldrel-windows-x86_64