Update org.springframework.data to 2021.2.15

Closes gh-13705

dependencies/spring-security-dependencies.gradle

@@ -12,7 +12,7 @@ dependencies {
 	api platform("io.rsocket:rsocket-bom:1.1.4")
 	api platform("org.junit:junit-bom:5.9.3")
 	api platform("org.mockito:mockito-bom:4.8.1")
-	api platform("org.springframework.data:spring-data-bom:2021.2.14")
+	api platform("org.springframework.data:spring-data-bom:2021.2.15")
 	api platform("org.jetbrains.kotlin:kotlin-bom:$kotlinVersion")
 	api platform("org.jetbrains.kotlinx:kotlinx-coroutines-bom:1.6.4")
 	api platform("com.fasterxml.jackson:jackson-bom:2.13.5")