Bump rack from 2.2.8.1 to 2.2.13 in /source/scripts/ruby/blog/source #812

Job	Run time
MacOS Clang Test (macos-13, debug, without-sanitizer)	21m 30s
MacOS Clang Test (macos-13, debug, address-sanitizer)	18m 8s
MacOS Clang Test (macos-13, debug, thread-sanitizer)	21m 6s
MacOS Clang Test (macos-13, release, without-sanitizer)	15m 54s
MacOS Clang Test (macos-14, debug, without-sanitizer)	10m 16s
MacOS Clang Test (macos-14, debug, address-sanitizer)	11m 44s
MacOS Clang Test (macos-14, debug, thread-sanitizer)	14m 35s
MacOS Clang Test (macos-14, release, without-sanitizer)	11m 53s
MacOS Distributable Dispatch	0s
	2h 5m 6s

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