chore(deps): bump certifi from 2026.4.22 to 2026.5.20 in /hack/api-docs (#6392)

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

hack/api-docs/requirements.txt

@@ -1,5 +1,5 @@
 Babel==2.18.0
-certifi==2026.4.22
+certifi==2026.5.20
 charset-normalizer==3.4.7
 click==8.4.1
 colorama==0.4.6