[BUG] Error in Vertx with header with "-"

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?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

code generate with error

        private final Map<String, Authentication> authentications = new LinkedHashMap<>();

        public void addX-Auth-TokenAuthentication(String apikey, String apiKeyPrefix) {
           ApiKeyAuth auth = new ApiKeyAuth("header","X-Auth-Token");
           auth.setApiKey(apikey);
           auth.setApiKeyPrefix(apiKeyPrefix);
           authentications.put("X-Auth-Token", auth);
        }

        public static AuthInfo forX-Auth-TokenAuthentication(String apikey, String apiKeyPrefix) {
            AuthInfo authInfo = new AuthInfo();
            authInfo.addX-Auth-TokenAuthentication(apikey, apiKeyPrefix);
            return authInfo;
        }
    }

openapi-generator version

7.0.1

OpenAPI declaration file content or url

  "swagger": "2.0",
....
  "securityDefinitions": {
    "X-Auth-Token": {
      "description": "",
      "type": "apiKey",
      "name": "X-Auth-Token",
      "in": "header"
    }
  },
....

Generation Details

	<execution>
		<goals>
			<goal>generate</goal>
		</goals>
		<configuration>
			<inputSpec>${project.basedir}/src/main/resources/swagger.json</inputSpec>
			<generatorName>java</generatorName>
			<cleanupOutput>true</cleanupOutput>
			<generateSupportingFiles>true</generateSupportingFiles>

			<modelNamePrefix>pre</modelNamePrefix>
			<generateApiTests>false</generateApiTests>
			<generateModelTests>false</generateModelTests>
			<generateApiDocumentation>true</generateApiDocumentation>
			<configOptions>
				<library>vertx</library>
				<dateLibrary>java8-localdatetime</dateLibrary>
			</configOptions>
		</configuration>
	</execution>
</executions>```

##### Steps to reproduce

to have an authorization header with "-"

##### Related issues/PRs

Reproduce the generation with the supplied Swagger 2.0 security definition, generatorName=java, and library=vertx, then trace how AuthInfo authentication method names are produced. Done means the X-Auth-Token header no longer creates invalid Java method names and the generated client remains compilable.