fix: Allow more email addresses in notification lists

[larseggert]

Fixes #4736

[rjsparks]

This is insufficient - a matching change to the document model is also needed, or the extra bits won't be stored in the database. See https://github.com/ietf-tools/datatracker/blob/main/ietf/doc/models.py#L111.

It's not immediately clear whether leaving this as a CharField in the model and making it significantly larger is the right thing to do. I suspect it probably needs to be converted to a TextField. Either way, the change will need to be accompanied by a migration effecting the change in the database.

(You build that with something like ietf/maange.py makemigrations doc after changing the model.)

[codecov]

Codecov Report

Merging #4792 (c7643bd) into main (9457e2b) will increase coverage by 0.00%.
The diff coverage is 82.75%.

@@           Coverage Diff           @@
##             main    #4792   +/-   ##
=======================================
  Coverage   88.45%   88.46%           
=======================================
  Files         296      296           
  Lines       39742    39752   +10     
=======================================
+ Hits        35155    35166   +11     
+ Misses       4587     4586    -1     

Impacted Files	Coverage Δ
ietf/utils/draft.py	71.75% <54.54%> (+0.11%)	⬆️
ietf/doc/forms.py	96.00% <100.00%> (ø)
ietf/doc/models.py	88.44% <100.00%> (ø)
ietf/doc/views_conflict_review.py	96.75% <100.00%> (ø)
ietf/doc/views_draft.py	91.96% <100.00%> (ø)
ietf/doc/views_status_change.py	93.38% <100.00%> (ø)
ietf/liaisons/forms.py	91.21% <100.00%> (ø)
ietf/meeting/helpers.py	89.87% <100.00%> (+0.04%)	⬆️
ietf/meeting/views.py	90.56% <100.00%> (+0.01%)	⬆️
ietf/doc/views_search.py	89.23% <0.00%> (ø)
... and 2 more

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[jennifer-richards]

Only comment is that I'd probably have named the migration something more descriptive (0048_lengthen_notification_lists or something), but that's a small nit. Looks good otherwise.