Update r2dbc-spi-test to 0.8.6.RELEASE

Closes gh-10393

oauth2/oauth2-client/spring-security-oauth2-client.gradle

@@ -24,7 +24,7 @@ dependencies {
 	testImplementation 'io.projectreactor.tools:blockhound'
 	testImplementation 'org.skyscreamer:jsonassert'
 	testImplementation 'io.r2dbc:r2dbc-h2:0.8.4.RELEASE'
-	testImplementation 'io.r2dbc:r2dbc-spi-test:0.8.5.RELEASE'
+	testImplementation 'io.r2dbc:r2dbc-spi-test:0.8.6.RELEASE'
 	testImplementation "org.assertj:assertj-core"
 	testImplementation "org.junit.jupiter:junit-jupiter-api"
 	testImplementation "org.junit.jupiter:junit-jupiter-params"