chore: update GPG org

This PR fixes the GPG check

Signed-off-by: Spencer Smith <[email protected]>
(cherry picked from commit 7a4bc89)

Author: rsmitty

.conform.yaml

@@ -5,7 +5,7 @@ policies:
       gpg:
         required: true
         identity:
-          gitHubOrganization: talos-systems
+          gitHubOrganization: siderolabs
       spellcheck:
         locale: US
       maximumOfOneCommit: false