Refactor `inputExtension` method in `io.quarkiverse.openapi.generator.deployment.codegen` package to `inputExtenions`

[ricardozanini]

The method inputExtension has been deprecated:

[WARNING] /Users/ricferna/dev/github/quarkiverse/quarkus-openapi-generator/client/deployment/src/main/java/io/quarkiverse/openapi/generator/deployment/codegen/OpenApiGeneratorCodeGenBase.java:[135,54] inputExtension() in io.quarkus.deployment.CodeGenProvider has been deprecated
[WARNING] /Users/ricferna/dev/github/quarkiverse/quarkus-openapi-generator/client/deployment/src/main/java/io/quarkiverse/openapi/generator/deployment/codegen/OpenApiGeneratorYmlCodeGen.java:[11,19] inputExtension() in io.quarkus.deployment.CodeGenProvider has been deprecated
[WARNING] /Users/ricferna/dev/github/quarkiverse/quarkus-openapi-generator/client/deployment/src/main/java/io/quarkiverse/openapi/generator/deployment/codegen/OpenApiGeneratorJsonCodeGen.java:[11,19] inputExtension() in io.quarkus.deployment.CodeGenProvider has been deprecated
[WARNING] /Users/ricferna/dev/github/quarkiverse/quarkus-openapi-generator/client/deployment/src/main/java/io/quarkiverse/openapi/generator/deployment/codegen/OpenApiGeneratorStreamCodeGen.java:[46,19] inputExtension() in io.quarkus.deployment.CodeGenProvider has been deprecated
[WARNING] /Users/ricferna/dev/github/quarkiverse/quarkus-openapi-generator/client/deployment/src/main/java/io/quarkiverse/openapi/generator/deployment/codegen/OpenApiGeneratorYamlCodeGen.java:[11,19] inputExtension() in io.quarkus.deployment.CodeGenProvider has been deprecated

Identify in which Quarkus version it has been deprecated and refactor the code base to use the new version. It's possible that in LTS we still have to use inputExtension.

[mcruzdev]

Hi @vladprado do you want to try it?

[vladprado]

Sure, @mcruzdev
I will take it as soon as I update the codestart PR.

[vladprado]

Adding that inputExtension is deprecated since 3.7.0.
That being said, since LTS is using 3.15.3, I believe we are good to update it too.

[mcruzdev]

Go for it @vladprado 🚀