Describe the bug

The swagger-initializer.js file being accepted by the browser is in the the JVM's default charset.
So on systems in which the default charset isn't UTF*, the browser seems to be getting a file which is unreadable.
Downloading the file and opening it up in the system's default encoding shows the correct contents.

To Reproduce
You'll have to load the JVM with a non-default charset.

• What version of spring-boot you are using?
  2.7.10

• What modules and versions of springdoc-openapi are you using?
  springdoc-openapiUi = "org.springdoc:springdoc-openapi-ui:1.7.0"

• What is the actual and the expected result using OpenAPI Description (yml or json)?
  N/A, the OpenAPI JSON loads fine

• Provide with a sample code (HelloController) or Test that reproduces the problem
  N/A

Expected behavior

• A clear and concise description of what you expected to happen.
  The swagger-initializer.js file accepted by the browser should be readable.

• What is the expected result using OpenAPI Description (yml or json)?
  N/A

Screenshots

Additional context
N/A