Bump actions/download-artifact from 4.1.9 to 4.3.0 #2546

Job	Run time
env-protect-setup	8s
authorize	4s
get-dev-image / get-image	5s
generate-matrix	23m 53s
clang-tidy	6m 4s
code-coverage	-1s
build-and-test (TSAN, nokvm, --config=tsan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	19m 43s
build-and-test (Clang opt + UI, nokvm, --config=clang --compilation_mode=opt, bazel_buildables_cl...	23m 58s
build-and-test (ASAN, nokvm, --config=asan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	20m 34s
build-and-test (GCC opt, nokvm, --config=gcc --compilation_mode=opt, bazel_buildables_gcc_opt, ba...	19m 17s
build-and-test (Clang debug, nokvm, --config=clang --compilation_mode=dbg, bazel_buildables_clang...	19m 31s
build-and-test (Go race detector, nokvm, --config=go_race --compilation_mode=opt, bazel_buildable...	15m 28s
build-and-test-status	4s
	2h 28m 48s

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