tests .to_rfc2822 panics

[gabrielfalcao]

Tests NaiveDateTime panics when year greater than 9999

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 97.22222% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.13%. Comparing base (33aaebf) to head (1129311).

Files with missing lines	Patch %	Lines
src/datetime/tests.rs	97.22%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1637      +/-   ##
==========================================
+ Coverage   91.11%   91.13%   +0.01%     
==========================================
  Files          37       37              
  Lines       17137    17173      +36     
==========================================
+ Hits        15614    15650      +36     
  Misses       1523     1523              

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[djc]

Why? What is the motivation here?