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[SPARK-56770][DOCS] Update PROJ version to 9.8.1 in the documentation… #18277

Job	Run time
Run / Check changes	59s
Run / Base image build	1m 5s
Run / Protobuf breaking change detection and Python CodeGen check	0s
Run / Run TPC-DS queries with SF=1	0s
Run / Java 17 build with Maven	0s
Run / Run Spark on Kubernetes Integration test	0s
Run / Build modules: ${{ matrix.modules }} ${{ matrix.comment }}	0s
Run / Java 25 build with Maven	0s
Run / Run Spark UI tests	0s
Run / Run Docker integration tests	0s
Run / Linters, licenses, and dependencies	28m 2s
Run / Documentation generation	0s
Run / Build modules: ${{ matrix.modules }}	0s
Run / Build modules: sparkr	0s
	30m 6s

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