Bump certifi from 2021.10.8 to 2025.6.15

---
updated-dependencies:
- dependency-name: certifi
  dependency-version: 2025.6.15
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements/production.txt

@@ -1,5 +1,5 @@
 -r base.txt
-certifi==2021.10.8
+certifi==2025.6.15
 django-redis-cache==3.0.1
 gevent==22.10.2  # Ensure this matches the updated version in base.txt
 greenlet==3.0.3  # Ensure this matches the updated version in base.txt