JacksonFeature NoClassDefFoundError

[youming-lin]

Describe the bug
I'm getting error running unit tests:

java.lang.NoClassDefFoundError: com.fasterxml.jackson.core.util.JacksonFeature
	at com.fasterxml.jackson.databind.ObjectMapper.<init>(ObjectMapper.java:673)
	at com.fasterxml.jackson.databind.ObjectMapper.<init>(ObjectMapper.java:576)
	at io.swagger.v3.core.util.ObjectMapperFactory.create(ObjectMapperFactory.java:79)
	at io.swagger.v3.core.util.ObjectMapperFactory.createJson(ObjectMapperFactory.java:65)
	at io.swagger.v3.core.util.Json.mapper(Json.java:13)
	at org.springdoc.ui.AbstractSwaggerIndexTransformer.<init>(AbstractSwaggerIndexTransformer.java:86)
	at org.springdoc.webmvc.ui.SwaggerIndexPageTransformer.<init>(SwaggerIndexPageTransformer.java:56)
<rest omitted>

I believe the issue is due to the jackson-core in webjars-locator-core is overriding its version for everything else:

Per https://fasterxml.github.io/jackson-core/javadoc/2.12/com/fasterxml/jackson/core/util/JacksonFeature.html, JacksonFeature is added in 2.12.0, which is newer than the version in webjars-locator-core.

Fix is to update webjars-locator-core to 0.48.0.