Update sl container for sl7 to current (build-date=20210601)
@@ -7,4 +7,4 @@ Tags: 7, latest
Architectures: amd64
GitFetch: refs/heads/7
Directory: sl7
-GitCommit: 979e472bf649dd7641a50a617d9f57be8324a6df
+GitCommit: ff49ec628f9b878a14039f346cbe895822144783
Tianon Gravi