Provide dependency management for Testcontainers

Closes gh-34712

spring-boot-project/spring-boot-dependencies/build.gradle

@@ -1446,6 +1446,13 @@ bom {
 			]
 		}
 	}
+	library("Testcontainers", "1.17.6") {
+		group("org.testcontainers") {
+			imports = [
+				"testcontainers-bom"
+			]
+		}
+	}
 	library("Thymeleaf", "3.1.1.RELEASE") {
 		group("org.thymeleaf") {
 			modules = [

spring-boot-project/spring-boot-parent/build.gradle

@@ -201,13 +201,6 @@ bom {
 			]
 		}
 	}
-	library("Testcontainers", "1.17.3") {
-		group("org.testcontainers") {
-			imports = [
-				"testcontainers-bom"
-			]
-		}
-	}
 }
 
 dependencies {