Remove a hardcoded list of month name abbreviations #18482
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Description
There is a hardcoded list of month name abbreviations in the IERS utilities, but there is no point in wasting 15 lines of code for something that can be easily looked up using the Python standard library.
EDIT
Turns out
calendar.Month
was introduced in Python 3.12, so we do need the hardcoded list as long as we support Python 3.11.