chore(deps-dev): bump certifi from 2025.4.26 to 2025.6.15

Bumps [certifi](https://github.com/certifi/python-certifi) from 2025.4.26 to 2025.6.15.
- [Commits](certifi/python-certifi@2025.04.26...2025.06.15)

---
updated-dependencies:
- dependency-name: certifi
  dependency-version: 2025.6.15
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements-dev.txt

@@ -14,7 +14,7 @@ build==1.2.2.post1
 
 bumpver==2024.1130
 
-certifi==2025.4.26 ; python_version >= '3.6'
+certifi==2025.6.15 ; python_version >= '3.6'
 
 cffi==1.17.1 ; os_name == 'nt' and implementation_name != 'pypy'