Fix typo in TestcontainersPropertySource

[sbrannen]

spring-boot/spring-boot-project/spring-boot-testcontainers/src/main/java/org/springframework/boot/testcontainers/properties/TestcontainersPropertySource.java

Line 132 in b1bf4bb

"Incorrect DynamicValuesPropertySource type registered");

That should read "Incorrect TestcontainersPropertySource type registered".

[amritagg]

Hello @sbrannen Can you assign me this issue?

[amritagg]

Attaching the PR here: #39440

[scottfrederick]

Closing in favor of #39440