Bump rack from 2.2.8.1 to 2.2.12 in /source/scripts/ruby/blog/source #811

Job	Run time
MacOS Clang Test (macos-13, release, without-sanitizer)	1h 43m 17s
MacOS Clang Test (macos-13, debug, without-sanitizer)	24m 51s
MacOS Clang Test (macos-13, debug, thread-sanitizer)	21m 42s
MacOS Clang Test (macos-14, debug, address-sanitizer)	12m 30s
MacOS Clang Test (macos-14, debug, without-sanitizer)	10m 0s
MacOS Clang Test (macos-13, debug, address-sanitizer)	21m 4s
MacOS Clang Test (macos-14, debug, thread-sanitizer)	13m 36s
MacOS Clang Test (macos-14, release, without-sanitizer)	13m 41s
MacOS Distributable Dispatch	0s
	3h 40m 41s

Provide feedback