fix(deps): bump black to 26.3.1 (Dependabot high: arbitrary file write) (#112)

Author: martinkersner

requirements/requirements-test.txt

@@ -2,6 +2,6 @@
 pytest-cov>=5
 pytest>=8
 responses>=0.25
-black==26.1.0
+black==26.3.1
 flake8==7.3.0
 wheel==0.46.3