Move 1.12.3 release to October (#3263) #4071

Job	Run time
Windows MSVC CMake REL TS	8m 31s
Windows MSVC CMake DBG TS	7m 24s
Windows MSVC CMake REL	15m 23s
Windows MSVC CMake DBG	20m 33s
Ubuntu gcc CMake REL TS	4m 20s
Ubuntu gcc CMake DBG TS	3m 48s
Ubuntu gcc CMake REL	9m 2s
Ubuntu gcc CMake DBG	10m 18s
Ubuntu gcc Autotools REL TS	7m 39s
Ubuntu gcc Autotools DBG TS	5m 51s
Ubuntu gcc Autotools REL	16m 53s
Ubuntu gcc Autotools DBG	17m 59s
Ubuntu gcc Autotools parallel (build only) REL TS	7m 24s
Ubuntu gcc Autotools parallel (build only) DBG TS	5m 33s
Ubuntu gcc Autotools parallel (build only) REL	8m 33s
Ubuntu gcc Autotools parallel (build only) DBG	9m 16s
MacOS Clang CMake REL TS	3m 42s
MacOS Clang CMake DBG TS	2m 41s
MacOS Clang CMake REL	7m 32s
MacOS Clang CMake DBG	8m 57s
Ubuntu gcc Autotools v1.6 default API (build only) DBG	12m 24s
Ubuntu gcc Autotools v1.8 default API (build only) DBG	11m 2s
Ubuntu gcc Autotools v1.10 default API (build only) DBG	8m 53s
Ubuntu gcc Autotools v1.12 default API (build only) DBG	11m 6s
Ubuntu gcc Autotools v1.14 default API (build only) DBG	9m 38s
Ubuntu gcc Autotools no deprecated symbols (build only) DBG	10m 6s
Ubuntu gcc Autotools -Werror (build only) DBG	7m 44s
Ubuntu gcc Autotools -Werror (build only) REL	10m 3s
Ubuntu gcc Autotools parallel -Werror (build only) DBG	5m 55s
Ubuntu gcc Autotools parallel -Werror (build only) REL	7m 52s
	4h 36m 2s

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