build: update rules_angular digest to e820ef9 #7977

Job	Run time
build	12s
e2e_windows (windows-2025, 22, npm, 0)	1s
e2e_windows (windows-2025, 22, npm, 3)	7s
e2e_windows (windows-2025, 22, npm, 2)	8s
e2e_windows (windows-2025, 22, npm, 1)	9s
e2e_windows (windows-2025, 22, esbuild, 1)	17s
e2e_windows (windows-2025, 22, esbuild, 0)	10s
e2e_windows (windows-2025, 22, npm, 4)	9s
e2e_windows (windows-2025, 22, npm, 5)	11s
e2e_windows (windows-2025, 22, esbuild, 2)	9s
e2e_windows (windows-2025, 22, esbuild, 4)	11s
e2e_windows (windows-2025, 22, esbuild, 3)	3s
lint	12s
e2e_windows (windows-2025, 22, esbuild, 5)	15s
test	1s
Browser Compatibility Tests	1s
e2e-package-managers	1s
publish-snapshots	1s
e2e	1s
e2e-snapshots	1s
	2m 20s

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