fix yml indentation

Author: perrydv

.github/workflows/test-suites.yml

@@ -11,7 +11,7 @@ on:
 
 env:
   RSPM: https://packagemanager.posit.co/cran/latest  # Enables Linux binaries from Posit
-    R_KEEP_PKG_SOURCE: yes  # Keeps sources for debugging if needed
+  R_KEEP_PKG_SOURCE: yes  # Keeps sources for debugging if needed
 
 
 jobs: