Update SmallRye Config to 1.9.0

[radcortez]

We do have quite a few changes in 1.9.0: https://github.com/smallrye/smallrye-config/releases/tag/1.9.0

Let me resume here:

#396 Cache EnvConfigSource. For #11782
#394 Bump snakeyaml from 1.26 to 1.27.
#392 Convert YAML keys to String. For #12036
#388 Bump version.smallrye.common from 1.3.0 to 1.4.0
#387 Fix Converter Priority and add unit test.
#375 ConfigSourceProvider injects unsorted map of Config Sources
#356 Add new default converter for java.util.UUID
#343 Add Currency converter
#342 Add BitSet Converter
#334 ConfigException parameters need re-ordering
#333 Configuration Mapper. New feature: https://smallrye.io/docs/smallrye-config/mapping/mapping.html
#313 Initial work to mix sources and interceptors priorities.
#283 Add API to specify default values
#196 Ability to use already retrieved Config in configuring things further down the chain. For #10390

[gastaldi]

LGTM, added a minor comment (more like a question) :)

[gsmet]

I think it should be squashed into 1 commit. The two commits are interdependent and it won't build with only one commit.

[radcortez]

I think it should be squashed into 1 commit. The two commits are interdependent and it won't build with only one commit.

Sure. Done!

Addressed.