Move to ldap.v3 to fix #5928

[zeripath]

As suggested in #5928 - this PR moves to ldap.v3 in an attempt to fix the regressions seen in LDAP.

I don't have a decent test case for this so I'm only working off what has been suggested.

Signed-off-by: Andrew Thornton art27@cantab.net

[codecov-io]

Codecov Report

Merging #6105 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6105      +/-   ##
==========================================
+ Coverage   38.85%   38.86%   +<.01%     
==========================================
  Files         345      345              
  Lines       49510    49510              
==========================================
+ Hits        19237    19241       +4     
+ Misses      27491    27486       -5     
- Partials     2782     2783       +1

Impacted Files	Coverage Δ
modules/auth/ldap/ldap.go	54.4% <ø> (ø)	⬆️
models/repo_list.go	63.29% <0%> (-1.27%)	⬇️
routers/repo/view.go	46.22% <0%> (+1.16%)	⬆️
models/unit.go	14.28% <0%> (+14.28%)	⬆️

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