added junit-vintage-engine dependency to avoid issues with existing JUnit4 tests

spring-boot-modules/spring-boot-environment/pom.xml

@@ -33,6 +33,17 @@
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.junit.vintage</groupId>
+            <artifactId>junit-vintage-engine</artifactId>
+            <scope>test</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.hamcrest</groupId>
+                    <artifactId>hamcrest-core</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
 
         <dependency>
             <groupId>org.springframework.boot</groupId>