Add CHANGES: Fixed SSL_export_keying_material for QUIC. #298

Job	Run time
cygwin (windows-2019, win64, -DCMAKE_C_COMPILER=gcc --strict-warnings no-fips)	32m 7s
minimal (windows-2019)	9m 38s
plain (windows-2019)	18m 20s
minimal (windows-2022)	8m 43s
shared (windows-2019, win64, enable-fips)	29m 25s
plain (windows-2022)	17m 33s
shared (windows-2019, win32, --strict-warnings no-fips)	32m 35s
shared (windows-2022, win64, enable-fips)	28m 12s
shared (windows-2022, win32, --strict-warnings no-fips)	32m 13s
	3h 28m 46s

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