Build: Bump gcsfs to 2026.6.0 (#3582) #9117

Job	Run time
integration-test-gcs	1m 17s
integration-test-s3	1m 17s
lint-and-unit-test (3.12)	3m 29s
lint-and-unit-test (3.14)	2m 44s
cibw-dev-env-smoke-test	31s
lint-and-unit-test (3.13)	3m 13s
lint-and-unit-test (3.10)	3m 17s
integration-test	11m 47s
integration-test-adls	1m 31s
lint-and-unit-test (3.11)	3m 8s
integration-coverage-report	39s
	32m 53s

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