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Add UPGRADING information for Zend API change #7013

Job	Run time
LINUX_X32_DEBUG_ZTS	0s
FREEBSD	0s
MACOS_${{ matrix.arch }}_DEBUG_NTS	0s
ALPINE_X64_ASAN_UBSAN_DEBUG_ZTS	0s
LINUX_X64_${{ matrix.debug && 'DEBUG' \|\| 'RELEASE' }}_${{ matrix.zts && 'ZTS' \|\| 'NTS' }}${{ matrix.asan && '_ASAN' \|\| '' }}	-1s
WINDOWS_X64_ZTS	-1s
BENCHMARKING	-7s
	-9s

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