Update ruff requirement from ~=0.14 to ~=0.15 (#1181)

* Update ruff requirement from ~=0.14 to ~=0.15

Updates the requirements on [ruff](https://github.com/astral-sh/ruff) to permit the latest version.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.14.0...0.15.0)

---
updated-dependencies:
- dependency-name: ruff
  dependency-version: 0.15.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

* Simplify challenge ID logging

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Mark Harrison <MarkZH@users.noreply.github.com>

Author: dependabot[bot]

lib/matchmaking.py

@@ -237,7 +237,7 @@ def challenge(self, active_games: set[str], challenge_queue: MULTIPROCESSING_LIS
         bot_username, base_time, increment, days, variant, mode = self.choose_opponent()
         logger.info(f"Will challenge {bot_username} for a {variant} game.")
         challenge_id = self.create_challenge(bot_username, base_time, increment, days, variant, mode) if bot_username else ""
-        logger.info(f"Challenge id is {challenge_id if challenge_id else 'None'}.")
+        logger.info(f"Challenge id is {challenge_id or 'None'}.")
         self.challenge_id = challenge_id
 
     def discard_challenge(self, challenge_id: str) -> None:

test_bot/test-requirements.txt

@@ -1,6 +1,6 @@
 pytest~=9.0
 pytest-timeout~=2.4
-ruff~=0.14
+ruff~=0.15
 mypy~=1.19
 types-requests~=2.32
 types-PyYAML~=6.0