android: update AGP to 8.7 and gradle to 8.9 #152

Job	Run time
build-android	3m 53s
build (windows-latest)	4m 21s
build-experimental (windows-latest)	2m 31s
build (ubuntu-latest)	1m 58s
build-ios	8m 6s
build-experimental (ubuntu-latest)	56s
build (macos-13)	2m 49s
build-experimental (macos-13)	1m 51s
build-kn	3m 49s
build-python (3.12, ubuntu-latest)	51s
build-rust (ubuntu-latest)	1m 48s
build-python (3.12, macos-13)	1m 8s
build-wasm	1m 28s
build-rust (macos-13)	3m 31s
build-ubuntu-sanitize	3m 34s
build-python (3.12, windows-latest)	2m 34s
build-rust (windows-latest)	4m 8s
build-winrt	2m 16s
	51m 32s

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