Bump maxminddb from 2.6.2 to 2.6.3 in /tests (#33)

Bumps [maxminddb](https://github.com/maxmind/MaxMind-DB-Reader-python) from 2.6.2 to 2.6.3.
- [Release notes](https://github.com/maxmind/MaxMind-DB-Reader-python/releases)
- [Changelog](https://github.com/maxmind/MaxMind-DB-Reader-python/blob/main/HISTORY.rst)
- [Commits](maxmind/MaxMind-DB-Reader-python@v2.6.2...v2.6.3)

---
updated-dependencies:
- dependency-name: maxminddb
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

tests/requirements.txt

@@ -1,2 +1,2 @@
-maxminddb==2.6.2
+maxminddb==2.6.3
 pycountry==24.6.1