Bump jaxb-impl from 3.0.2 to 4.0.0 (#144)

Author: dependabot[bot]

build.gradle

@@ -60,7 +60,7 @@ dependencies {
 	//JAXB (needed for hibernate, but not longer contained in JDK9+)
 	implementation 'javax.xml.bind:jaxb-api:2.3.1'
 	implementation 'com.sun.xml.bind:jaxb-core:4.0.0'
-	implementation 'com.sun.xml.bind:jaxb-impl:3.0.2'
+	implementation 'com.sun.xml.bind:jaxb-impl:4.0.0'
 	implementation 'javax.activation:activation:1.1.1'
 
 	//database