update heapsize to 8g #8654

Job	Run time
android-arm / initialize	1m 30s
android-x86 / initialize	36s
android-arm64 / initialize	33s
android-arm64 / docker-build-image	1m 14s
android-arm64 / docker-unittest-image	0s
android-x86 / docker-build-image	1m 23s
android-x86 / docker-unittest-image	0s
android-arm / docker-build-image	1m 8s
android-arm / docker-unittest-image	0s
android-arm64 / arm64_devel	18m 12s
android-arm64 / arm64_debug	20m 18s
android-arm64 / arm64_qa	8m 38s
android-arm64 / arm64_gold	7m 22s
android-x86 / x86_devel	23m 24s
android-x86 / x86_debug	18m 19s
android-x86 / x86_qa	8m 5s
android-x86 / x86_gold	7m 56s
android-arm / arm_devel	19m 10s
android-arm / arm_debug	16m 11s
android-arm / arm_qa	7m 28s
android-arm / arm_gold	8m 0s
android-arm / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-arm64 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm64 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-x86 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-x86 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
	2h 49m 27s

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