Escape special characters in LDAP DNs when used in search filters

[cfryanr]

Addresses #1147.

Release note:

Bug fix: Fix issue #1147 by escaping special characters in LDAP DNs when used in search filters

[codecov]

Codecov Report

Merging #1148 (c74dea6) into main (24b0ddf) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1148      +/-   ##
==========================================
+ Coverage   79.70%   79.73%   +0.02%     
==========================================
  Files         136      136              
  Lines       10054    10055       +1     
==========================================
+ Hits         8014     8017       +3     
+ Misses       1769     1767       -2     
  Partials      271      271              

Impacted Files	Coverage Δ
internal/upstreamldap/upstreamldap.go	85.71% <100.00%> (+0.03%)	⬆️
...l/localuserauthenticator/localuserauthenticator.go	57.20% <0.00%> (+0.93%)	⬆️

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