fix: updated at_contacts_group_flutter to 4.0.16 and at_chat_flutter to 3.0.13 #304

Job	Run time
static_analysis (at_backupkey_flutter, stable)	1m 32s
static_analysis (at_backupkey_flutter, beta)	1m 25s
static_analysis (at_chat_flutter, stable)	1m 26s
static_analysis (at_chat_flutter, beta)	1m 18s
static_analysis (at_common_flutter, stable)	1m 3s
static_analysis (at_common_flutter, beta)	1m 8s
static_analysis (at_contacts_flutter, stable)	1m 23s
static_analysis (at_contacts_flutter, beta)	1m 20s
static_analysis (at_contacts_group_flutter, stable)	1m 26s
static_analysis (at_contacts_group_flutter, beta)	1m 29s
static_analysis (at_events_flutter, stable)	1m 33s
static_analysis (at_events_flutter, beta)	1m 35s
static_analysis (at_follows_flutter, stable)	1m 23s
static_analysis (at_follows_flutter, beta)	1m 20s
static_analysis (at_invitation_flutter, stable)	1m 18s
static_analysis (at_invitation_flutter, beta)	1m 21s
static_analysis (at_location_flutter, stable)	1m 29s
static_analysis (at_location_flutter, beta)	1m 28s
static_analysis (at_login_flutter, stable)	1m 28s
static_analysis (at_login_flutter, beta)	1m 27s
static_analysis (at_notify_flutter, stable)	1m 19s
static_analysis (at_notify_flutter, beta)	1m 25s
static_analysis (at_onboarding_flutter, stable)	1m 22s
static_analysis (at_onboarding_flutter, beta)	1m 17s
static_analysis (at_sync_ui_flutter, stable)	1m 19s
static_analysis (at_sync_ui_flutter, beta)	1m 22s
static_analysis (at_theme_flutter, stable)	1m 28s
static_analysis (at_theme_flutter, beta)	1m 23s
	38m 47s

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