fix: Correctly linkify all current TLDs

[larseggert]

Fixes #3866.

Doesn't actually work, because bleach seems to have deeper issues. See mozilla/bleach#656.

[rjsparks]

Note that we are on Bleach 4.1.0 until we can move off python3.6 (which is hopefully sometime next week).
The folks responding at Bleach may be testing with 5.0.0

[larseggert]

I misunderstood the bleach API; this should now work (and fix the issue).

[codecov]

Codecov Report

Merging #3868 (c88e96e) into main (92e67ac) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #3868   +/-   ##
=======================================
  Coverage   87.99%   87.99%           
=======================================
  Files         297      297           
  Lines       38771    38773    +2     
=======================================
+ Hits        34115    34118    +3     
+ Misses       4656     4655    -1     

Impacted Files	Coverage Δ
ietf/utils/text.py	85.10% <0.00%> (-0.30%)	⬇️
ietf/doc/templatetags/ietf_filters.py	81.35% <0.00%> (-0.06%)	⬇️
ietf/utils/templatetags/textfilters.py	100.00% <0.00%> (ø)
ietf/nomcom/utils.py	92.11% <0.00%> (+0.54%)	⬆️

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