Build: Bump gcsfs to 2026.6.0 #9115

Job	Run time
integration-test	10m 56s
integration-test-adls	1m 25s
integration-test-gcs	1m 19s
lint-and-unit-test (3.13)	3m 21s
cibw-dev-env-smoke-test	28s
lint-and-unit-test (3.14)	2m 39s
lint-and-unit-test (3.11)	3m 12s
lint-and-unit-test (3.10)	3m 21s
lint-and-unit-test (3.12)	3m 15s
integration-test-s3	1m 21s
integration-coverage-report	34s
	31m 51s

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