Bump certifi in /doc in the github-actions group across 1 directory

Bumps the github-actions group with 1 update in the /doc directory: [certifi](https://github.com/certifi/python-certifi).


Updates `certifi` from 2026.5.20 to 2026.6.17
- [Commits](certifi/python-certifi@2026.05.20...2026.06.17)

---
updated-dependencies:
- dependency-name: certifi
  dependency-version: 2026.6.17
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: github-actions
...

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

Author: dependabot[bot]

doc/pyproject.toml

@@ -19,7 +19,7 @@ ignore_file   = '.skjoldignore'
 # urllib3>=2.0.7 by CVE-2023-45803
 [dependency-groups]
 dev = [
-    "certifi>=2026.5.20",
+    "certifi>=2026.6.17",
     "idna>=3.18",
     "jinja2>=3.1.4",
     "packaging>=26.2",