update(expat): version 2.6.4 (#4760) #2635

Job	Run time
android-arm64-v8a-ndk-cmake	8m 17s
android-arm64-v8a-ndk-latest-cmake	8m 6s
android-armeabi-v7a-ndk-cmake	8m 6s
linux-gcc-make-armv7l	14m 1s
linux-gcc-make	25m 20s
linux-gcc-make-asan	34m 2s
linux-gcc-make-asan-no-soo	33m 43s
linux-gcc-make-cxx20	34m 45s
linux-gcc-make-trace	25m 6s
linux-gcc-make-tsan	27m 33s
linux-gcc-make-ubsan	37m 41s
linux-emscripten-cmake	4m 46s
linux-gcc-cmake	22m 1s
linux-gcc-cmake-unbundled	21m 50s
linux-gcc-make-cross-armhf	14m 22s
macos-clang-cmake-openssl3	28m 22s
macos-clang-cmake-openssl3-visibility-hidden	25m 37s
macos-clang-make	44m 50s
macos-clang-make-openssl3-tsan	24m 37s
macos-clang-make-visibility-hidden	38m 37s
linux-gcc-make-mongodb	7m 26s
linux-gcc-make-mysql	7m 39s
linux-gcc-make-odbc	13m 4s
linux-gcc-make-postgres	7m 20s
linux-gcc-make-redis	7m 25s
linux-gcc-make-sqlite-no-sqlparser	7m 16s
macos-clang-make-openssl3-ubsan	43m 39s
windows-2022-msvc-buildwin-x64	37m 40s
macos-clang-make-openssl3-asan	45m 15s
windows-2022-msvc-cmake	22m 45s
	11h 21m 11s

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