Update certifi to v2026 #1529

Job	Run time
python-tests	10s
readme-links-test / test-readme-links	16s
dry-run-update-api-spec / update-api-spec	1m 0s
dry-run-publish-library / build-and-publish	1m 38s
dry-run-publish-javadoc / build-javadoc	1m 37s
kotlin-tests	5m 49s
dry-run-publish-javadoc / publish-javadoc	6s
	10m 36s

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