📝 update MSRV

[ttytm]

Future changes should be covered by #324, which currently:

Ref.: https://github.com/ttytm/wthrr-the-weathercrab/actions/runs/9472508372?pr=324

[github-actions]

Filename                              Stmts    Miss  Cover    Missing
----------------------------------  -------  ------  -------  ------------------------------------------------------------
src/main.rs                              13      13  0.00%    26-43
src/modules/display/border.rs            47      47  0.00%    17-106
src/modules/display/current.rs           83      83  0.00%    37-228
src/modules/display/day.rs               57      57  0.00%    29-164
src/modules/display/graph.rs            171     166  2.92%    65-368
src/modules/display/gui_config.rs        15      12  20.00%   46-61
src/modules/display/historical.rs        61      61  0.00%    35-201
src/modules/display/hourly.rs           193     193  0.00%    40-396
src/modules/display/product.rs           19      19  0.00%    24-64
src/modules/display/utils.rs             46      46  0.00%    6-85
src/modules/display/weathercode.rs       31      31  0.00%    11-41
src/modules/display/week.rs              51      51  0.00%    30-137
src/modules/display/wind.rs              21      21  0.00%    17-42
src/modules/api.rs                       24      13  45.83%   26-29, 38, 49-88
src/modules/args.rs                       4       4  0.00%    91-95
src/modules/config.rs                    31      25  19.35%   52-97
src/modules/forecast.rs                  20       6  70.00%   7-8, 24-25, 27-28
src/modules/localization.rs             104      40  61.54%   162-203, 230-262
src/modules/location.rs                  55      28  49.09%   25-29, 59-63, 75, 89, 95-104, 109, 118-126, 131-132, 142-143
src/modules/params.rs                    55      55  0.00%    24-137
src/modules/units.rs                     13       0  100.00%
src/modules/weather.rs                   26      26  0.00%    83-154
TOTAL                                  1140     997  12.54%