address lintr updates

[nicholas-masel]

Background Information

> lintr::lint_package()

> Error: Malformed config file, ensure it ends in a newline
> Malformed config file, ensure it ends in a newline
> Function with_defaults was deprecated in lintr version 3.0.0. Use linters_with_defaults or modify_defaults instead.

> Trying to remove ‘single_quotes_linter’, which is not in defaults.

Definition of Done

Update the config to use linters_with_defaults() and update the lintr config to remove single_quotes_linter = NULL, since this is no longer a default lint.