Merge pull request #500 from vvoland/update-rootless-28.3.0-rc.1

rootless: update test version to 28.3.0-rc.1

Author: vvoland

rootless-install.sh

@@ -24,7 +24,7 @@ SCRIPT_COMMIT_SHA=UNKNOWN
 STABLE_LATEST="28.2.1"
 
 # latest version available in the test channel.
-TEST_LATEST="28.2.1"
+TEST_LATEST="28.3.0-rc.1"
 
 # The channel to install from:
 #   * test