Update run-tests.yaml to use rstudio-ci:4.3.3

Author: pbchase

.github/workflows/run-tests.yaml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
 
     container:
-      image: ghcr.io/ctsit/rstudio-ci:4.2.1
+      image: ghcr.io/ctsit/rstudio-ci:4.3.3
 
     env:
       CI: "TRUE"