fix: Use settings.TIME_ZONE when looking up telechat agenda_date()

[jennifer-richards]

Fixes #4976

[codecov]

Codecov Report

Merging #5020 (9e982ea) into main (570bd14) will decrease coverage by 0.02%.
The diff coverage is 98.24%.

@@            Coverage Diff             @@
##             main    #5020      +/-   ##
==========================================
- Coverage   88.47%   88.46%   -0.02%     
==========================================
  Files         296      296              
  Lines       39818    39852      +34     
==========================================
+ Hits        35230    35255      +25     
- Misses       4588     4597       +9     

Impacted Files	Coverage Δ
ietf/meeting/views.py	90.69% <98.00%> (+0.12%)	⬆️
ietf/iesg/agenda.py	92.06% <100.00%> (+0.06%)	⬆️
ietf/utils/text.py	86.58% <100.00%> (+0.60%)	⬆️
ietf/meeting/templatetags/proceedings_filters.py	88.23% <0.00%> (-5.89%)	⬇️
ietf/meeting/models.py	85.91% <0.00%> (-0.59%)	⬇️
ietf/group/models.py	92.30% <0.00%> (-0.37%)	⬇️
ietf/utils/draft.py	71.44% <0.00%> (-0.31%)	⬇️
ietf/doc/views_search.py	89.23% <0.00%> (ø)

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