Merge pull request #7833 from scientificlinux/sl7

Update sl container for sl7 to current (build-date=20200420)

library/sl

@@ -8,7 +8,7 @@ Tags: 7, latest
 Architectures: amd64
 GitFetch: refs/heads/7
 Directory: sl7
-GitCommit: ed9b6b4a7eb3b802a57c06ceac31340955b34f54
+GitCommit: 88265b18997404f09ebbaec86bdfc87bca434963
 
 # For the SL6 container
 Tags: 6