Merge pull request #130 from timewarrior-synchronize/dependabot/pip/black-approx-eq-25.12

Update black requirement from ~=25.11 to ~=25.12

Author: arneturuc

requirements-dev.txt

@@ -6,4 +6,4 @@ requests~=2.32.5
 iniconfig~=2.3.0
 pluggy~=1.6.0
 pytest~=9.0.2
-black~=25.11
+black~=25.12