[R] Fix winbuilder check warnings. #13826

Job	Run time
Build libxgboost4j.dylib for MacOS (Apple Silicon)	1m 59s
Build and test JVM packages (Linux, Scala 2.13)	5m 38s
Build libxgboost4j.dylib for MacOS (Intel)	3m 19s
Build and test JVM packages (Linux, Scala 2.12)	10m 59s
Build libxgboost4j.so with CUDA	7m 58s
Build libxgboost4j.so targeting glibc 2.17 (arch aarch64, runner linux-arm64-cpu)	2m 16s
Build libxgboost4j.so targeting glibc 2.17 (arch x86_64, runner linux-amd64-cpu)	2m 6s
Build and test JVM packages (macos-15-intel)	11m 14s
Build and test JVM packages (windows-latest)	8m 49s
Test JVM packages with CUDA (Scala 2.13)	8m 27s
Test JVM packages with CUDA (Scala 2.12)	8m 17s
Deploy JVM packages to S3 (cpu, Scala 2.13)	13s
Deploy JVM packages to S3 (cpu, Scala 2.12)	14s
Deploy JVM packages to S3 (gpu, Scala 2.12)	16s
Deploy JVM packages to S3 (gpu, Scala 2.13)	16s
	1h 12m 1s

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