chore: Manually upgrade gdUnit4 to v6.0.0 (#407)

Author: limbonaut

.github/actions/prepare-testing/action.yml

@@ -98,10 +98,6 @@ runs:
       shell: bash
       run: |
         scons project/addons/gdUnit4
-        echo "Applying gdUnit4 patch"
-        cd modules/gdUnit4
-        # NOTE: Patching gdUnit4 as it errors out in Godot 4.5.
-        git apply ../gdunit4.patch
 
     - name: Prepare project
       shell: bash

modules/gdUnit4

@@ -27,13 +27,14 @@ func _before_send(_ev: SentryEvent) -> SentryEvent:
 
 ## Only two errors should be logged within the assigned time window.
 func test_throttling_limits() -> void:
-	var monitor := monitor_signals(self, false)
+	monitor_signals(self, false)
+
 	push_error("dummy-error")
 	push_error("dummy-error")
 	push_error("dummy-error")
-	await assert_signal(monitor).is_emitted("callback_processed")
-	await assert_signal(monitor).is_emitted("callback_processed")
-	await get_tree().create_timer(0.1).timeout
+
+	await assert_signal(self).is_emitted("callback_processed")
+	await get_tree().process_frame  # allow all events to process
 	assert_int(_num_events).is_equal(2)
 
 	# Wait for throttling window to expire.
@@ -42,7 +43,6 @@ func test_throttling_limits() -> void:
 	push_error("dummy-error")
 	push_error("dummy-error")
 	push_error("dummy-error")
-	await assert_signal(monitor).is_emitted("callback_processed")
-	await assert_signal(monitor).is_emitted("callback_processed")
-	await get_tree().create_timer(0.1).timeout
+	await assert_signal(self).is_emitted("callback_processed")
+	await get_tree().process_frame  # allow all events to process
 	assert_int(_num_events).is_equal(4)