Upgrade to Archunit 1.4.1.

Also, remove unused degraph.

Closes #2169

pom.xml

@@ -50,7 +50,7 @@
 		<oracle-r2dbc.version>1.3.0</oracle-r2dbc.version>
 
 		<!-- test dependencies -->
-		<archunit.version>1.3.0</archunit.version>
+		<archunit.version>1.4.1</archunit.version>
 
 		<mbr.version>0.4.0.BUILD-SNAPSHOT</mbr.version>
 	</properties>

spring-data-r2dbc/pom.xml

@@ -25,7 +25,6 @@
 		<java-module-name>spring.data.r2dbc</java-module-name>
 		<sonar.dynamicAnalysis>reuseReports</sonar.dynamicAnalysis>
 
-		<degraph-check.version>0.1.4</degraph-check.version>
 		<r2dbc-spi.version>1.0.0.RELEASE</r2dbc-spi.version>
 		<reactive-streams.version>1.0.4</reactive-streams.version>
 		<netty>4.2.3.Final</netty>
@@ -295,13 +294,6 @@
 			<scope>test</scope>
 		</dependency>
 
-		<dependency>
-			<groupId>de.schauderhaft.degraph</groupId>
-			<artifactId>degraph-check</artifactId>
-			<version>${degraph-check.version}</version>
-			<scope>test</scope>
-		</dependency>
-
 		<dependency>
 			<groupId>io.mockk</groupId>
 			<artifactId>mockk-jvm</artifactId>