Use modern configparser APIs in versioneer

[Mirochill]

Description

Update the vendored versioneer.py configuration parsing path to use the modern configparser APIs.

Todos

Notable points that this PR has either accomplished or will accomplish.

• Replace SafeConfigParser() with ConfigParser().
• Replace readfp() with read_file().

Questions

• None at this time.

Status

• Ready to go

Validation

• git diff --check
• git diff --cached --check
• rg --line-number SafeConfigParser|readfp versioneer.py setup.py setup.cfg HDXer returned no matches
• Not run locally

Closes #10