fix(deps): drop requests-mock from runtime deps

requests-mock is only imported by tests and does not belong in runtime
dependencies.

It was originally added as a test-only dependency and was accidentally
promoted into project.dependencies during the hatchling migration in
5e47f8b.

Signed-off-by: Ihar Hrachyshka <ihar.hrachyshka@gmail.com>

Author: booxter

pyproject.toml

@@ -44,7 +44,6 @@ dependencies = [
     "rich",
     "requests",
     "resolvelib",
-    "requests-mock",
     "starlette",
     "stevedore",
     "tomlkit",