Update budget window

[nikhilwoodruff]

OpenFisca-UK now only supports the 2022-27 budget window, dropping support for 2019-21. This updates all references and logic using the old budget window. Also ensures the OpenFisca-UK code runs locally (for me, soon hopefully for @jpycroft).

[codecov[bot]]

Codecov Report

Merging #47 (54846f0) into main (d911ee7) will increase coverage by 2.81%. The diff coverage is 90.90%.

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
+ Coverage   63.15%   65.97%   +2.81%     
==========================================
  Files           6        6              
  Lines         323      335      +12     
==========================================
+ Hits          204      221      +17     
+ Misses        119      114       -5     

Flag	Coverage Δ
unittests	65.97% <90.90%> (+2.81%)	:arrow_up:

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Impacted Files	Coverage Δ
examples/run_oguk.py	57.35% <ø> (ø)
setup.py	0.00% <0.00%> (ø)
oguk/get_micro_data.py	92.64% <88.88%> (+7.35%)	:arrow_up:
oguk/tests/test_get_micro_data.py	87.50% <100.00%> (+5.35%)	:arrow_up:

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[nikhilwoodruff]

@jdebacker just got the tests passing - OK to merge?

[rickecon]

Looks great to me. Thanks @nikhilwoodruff and @jdebacker.