Update golang.org/x/net digest to 3211cb9

This MR contains the following updates:

Package	Type	Update	Change
golang.org/x/net	require	digest	2871e0c -> 3211cb9

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go.mod

@@ -2,4 +2,4 @@ module git.autistici.org/ai3/tools/webdav-server-go
 
 go 1.15
 
-require golang.org/x/net v0.0.0-20220425223048-2871e0cb64e4
+require golang.org/x/net v0.0.0-20220812174116-3211cb980234