ci: Fix failing CI by pinning bundler version #504

Job	Run time
tests (test:ios)	12m 37s
tests (test:macos)	4m 53s
docs	2m 26s
tests (test:facebook_utils:ios)	9m 18s
tests (test:twitter_utils:ios)	9m 53s
tests (test:parseui:all)	12m 13s
tests (test:parse_live_query:all)	3m 23s
tests (build:starters)	8m 33s
tests (xcode15)	6m 15s
	1h 9m 31s

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