Update io.r2dbc:r2dbc-h2 to 1.0.0.RC1

Closes gh-11479

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

@@ -22,7 +22,7 @@ dependencies {
 	testImplementation 'io.projectreactor.netty:reactor-netty'
 	testImplementation 'io.projectreactor:reactor-test'
 	testImplementation 'org.skyscreamer:jsonassert'
-	testImplementation 'io.r2dbc:r2dbc-h2:0.9.1.RELEASE'
+	testImplementation 'io.r2dbc:r2dbc-h2:1.0.0.RC1'
 	testImplementation 'io.r2dbc:r2dbc-spi-test:0.9.1.RELEASE'
 	testImplementation "org.assertj:assertj-core"
 	testImplementation "org.junit.jupiter:junit-jupiter-api"