Build: Fix deprecated Groovy syntax in spring-aspects

Replace legacy Groovy DSL property assignment (space-separated) with
the standard assignment operator (=) in spring-aspects.gradle.

The legacy syntax is deprecated in Gradle 9 and will be removed in
Gradle 10. This change eliminates deprecation warnings during the
build and ensures future compatibility.

See gh-36132

Signed-off-by: Yejeong, Ham <dev@thelightway.kr>

spring-aspects/spring-aspects.gradle

@@ -3,15 +3,15 @@ description = "Spring Aspects"
 apply plugin: "io.freefair.aspectj"
 
 compileAspectj {
-	sourceCompatibility "17"
-	targetCompatibility "17"
+	sourceCompatibility = "17"
+	targetCompatibility = "17"
 	ajcOptions {
 		compilerArgs += "-parameters"
 	}
 }
 compileTestAspectj {
-	sourceCompatibility "17"
-	targetCompatibility "17"
+	sourceCompatibility = "17"
+	targetCompatibility = "17"
 	ajcOptions {
 		compilerArgs += "-parameters"
 	}