[BUG][OpenAPI] Conversion from Swagger (v2) host field to server url field (v3) results in an additional trailing slash at the end of the url

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?

Description

Conversion from Swagger (v2) host field to server url field (v3) results in an additional trailing slash at the end of the url.

openapi-generator version

7.0.1-SNAPSHOT (docker)

OpenAPI declaration file content or url

INPUT

swagger: "2.0"
info:
  title: Title
  version: version
host: someHost

OUTPUT

openapi: 3.0.1
info:
  title: Title
  version: version
servers:
- url: https://someHost/
                     # ^ This slash is extra

Generation Details

docker run --rm -v ${PWD}:/local openapitools/openapi-generator-cli generate --remove-operation-id-prefix -p outputFile=openapi.yaml -i /local/swagger.yaml -g openapi-yaml -o /local/gen/openapi-v3

Steps to reproduce

Generate using the provided command on the provided swagger v2 file.

Start by running the provided Docker generation command with the minimal Swagger 2.0 input and inspect the conversion path that produces the OpenAPI 3 servers.url value. Compare the generated URL with the expected value and add or update coverage for the absent trailing slash; done means the conversion preserves the host without adding an extra slash.