Chore(deps): Bump certifi in /services/stackitmarketplace

Bumps [certifi](https://github.com/certifi/python-certifi) from 2026.6.17 to 2026.10.19.
- [Commits](certifi/python-certifi@2026.06.17...2026.10.19)

---
updated-dependencies:
- dependency-name: certifi
  dependency-version: 2026.10.19
  dependency-type: indirect
...

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

Author: dependabot[bot]