chore(deps): update dependency black to v26

Author: renovate[bot]

backend/data_tools/Pipfile

@@ -37,7 +37,7 @@ pytest-cov = "==7.0.0"
 pytest-mock = "==3.15.1"
 ipython = "==9.9.0"
 pytest-docker = {extras = ["docker-compose-v2"], version = "==3.2.5"}
-black = {extras = ["d"], version = "==25.12.0"}
+black = {extras = ["d"], version = "==26.1.0"}
 isort = "==7.0.0"
 
 [requires]