Merge pull request #10483 from scientificlinux/sl7

Update sl container for sl7 to current (build-date=20210706)

library/sl

@@ -7,4 +7,4 @@ Tags: 7, latest
 Architectures: amd64
 GitFetch: refs/heads/7
 Directory: sl7
-GitCommit: ff49ec628f9b878a14039f346cbe895822144783
+GitCommit: 42160431c78d1c3c2217d5e090b8bf72f61b489b