[docs] Recommend latest Bundler #11979

Job	Run time
lint_node	32s
build_node (ubuntu-latest)	2m 13s
Ruby 3.1 on ubuntu-latest	12m 52s
build_node (macos-latest)	2m 8s
Ruby 3.2 on ubuntu-latest	10m 0s
build_node (windows-latest)	8m 36s
lint_ruby	26s
spelling	16s
Ruby 3.3 on ubuntu-latest	9m 44s
Ruby 3.1 on macos-latest	9m 3s
Verify Jekyll website builds	8s
Ruby 3.2 on macos-latest	6m 20s
Ruby 3.3 on macos-latest	6m 19s
Ruby 3.1 on windows-latest	21m 18s
Ruby 3.2 on windows-latest	20m 19s
Ruby 3.3 on windows-latest	21m 35s
	2h 11m 49s

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