deps(kesaseteli): upgrade pip-tools to 7.5.2 so it works with pip 25.3

See jazzband/pip-tools#2253

refs YJDH-766

Author: karisal-anders

backend/kesaseteli/requirements-dev.txt

@@ -56,7 +56,7 @@ packaging==24.1
     # via
     #   build
     #   pytest
-pip-tools==7.4.1
+pip-tools==7.5.2
     # via -r requirements-dev.in
 platformdirs==4.2.2
     # via virtualenv