Update sl container for sl7 to current (build-date=20210901)
@@ -7,4 +7,4 @@ Tags: 7, latest
Architectures: amd64
GitFetch: refs/heads/7
Directory: sl7
-GitCommit: c70b981bb6e70a4b03efa57a258dbfbf43668f2e
+GitCommit: 2975fd24b6b6112f615cd4cafa327e6e8f2a9f83
yosifkit