Update sl container for sl7 to current (build-date=20210803)
@@ -7,4 +7,4 @@ Tags: 7, latest
Architectures: amd64
GitFetch: refs/heads/7
Directory: sl7
-GitCommit: 42160431c78d1c3c2217d5e090b8bf72f61b489b
+GitCommit: c70b981bb6e70a4b03efa57a258dbfbf43668f2e
yosifkit