chore(XML): #4477: Upgrade bundled libexpat to 2.6.1 #2017

Job	Run time
android-arm64-v8a-ndk-cmake	1s
android-arm64-v8a-ndk-latest-cmake	1s
android-armeabi-v7a-ndk-cmake	1s
linux-gcc-make	1s
linux-gcc-make-armv7l	1s
linux-emscripten-cmake	1s
linux-gcc-cmake	1s
linux-gcc-make-asan-no-soo	1s
linux-gcc-make-asan	1s
linux-gcc-make-cxx20	1s
linux-gcc-make-cross-armhf	1s
linux-gcc-make-tsan	1s
linux-gcc-make-ubsan	1s
macos-clang-cmake-openssl	1s
macos-clang-make	1s
macos-clang-make-openssl3-asan	1s
macos-clang-cmake-openssl3-visibility-hidden	1s
macos-clang-cmake-openssl3	1s
macos-clang-make-openssl3-tsan	1s
macos-clang-make-openssl3-ubsan	1s
macos-clang-make-visibility-hidden	1s
linux-gcc-make-mongodb	1s
linux-gcc-make-mysql	1s
linux-gcc-make-odbc	1s
linux-gcc-make-postgres	1s
linux-gcc-make-redis	1s
windows-2022-msvc-buildwin-x64	1s
linux-gcc-make-sqlite-no-sqlparser	1s
windows-2022-msvc-cmake	1s
	29s

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