Include @Inject TCK tests in the build again

Commit 979508a7f3 removed the JUnit 4
dependency from all modules except spring-test. Unfortunately, the
@Inject TCK tests (SpringAtInjectTckTests) are still based on JUnit 3.
Thus, that commit accidentally excluded those tests from the build.

This commit includes SpringAtInjectTckTests in the build again by
introducing a test runtime dependency on the JUnit Vintage TestEngine
in spring-context.

See gh-23451

spring-context/spring-context.gradle

@@ -39,4 +39,5 @@ dependencies {
 	testRuntime("javax.xml.bind:jaxb-api")
 	testRuntime("org.glassfish:javax.el")
 	testRuntime("org.javamoney:moneta")
+	testRuntime("org.junit.vintage:junit-vintage-engine") // for @Inject TCK
 }

src/checkstyle/checkstyle-suppressions.xml

@@ -17,7 +17,7 @@
 	<suppress files="RootBeanDefinition" checks="EqualsHashCode" />
 
 	<!-- spring-context -->
-	<suppress files="SpringAtInjectTckTests" checks="IllegalImportCheck" />
+	<suppress files="SpringAtInjectTckTests" checks="IllegalImportCheck" id="bannedJUnit3Imports" />
 
 	<!-- spring-core -->
 	<suppress files="[\\/]src[\\/]main[\\/]java[\\/]org[\\/]springframework[\\/]asm[\\/]" checks=".*" />