fix: Correct class name of HttpTransporterFactory

[pieninck]

fixes #2392

[marcingrzejszczak]

I wonder how to test this. The only thing that comes to my mind is for now a unit test that would literally check if those strings are FQN of classes taken from the classpath. We have the classes on the classpath already, if we extract the strings into constants we could unit test if those constants are equal to FQN of org.eclipse.aether.transport.http.HttpTransporterFactory.class . That way we will ensure that no typos are present. WDYT?

[pieninck]

This means that spelling mistakes are at least immediately noticeable. I will extract the strings into constants and add tests to check them against the FQN.

[pieninck]

I tried to implement your suggestion of extracting and testing the fqn. Since it was my first commit to a spring project, please let me know if anything is missing.