false positive in OrphanedFormatString check for non-traditional URL schemes

[erm-g]

What version of Error Prone are you using? Latest - 2.33.0

Does this issue reproduce with the latest release? Yes

What did you do?

public static void main(String[] args) {
    StringBuilder url = new StringBuilder("https://mydomain%21com/");
    url.append("path");
    System.out.println(url);
    url = new StringBuilder("spiffe://mydomain%21com/");
    url.append("path");
    System.out.println(url);
}

What did you expect to see? No warning

What did you see instead? [9,29] [OrphanedFormatString] String literal contains format specifiers, but is not passed to a format method [9,29] indicates "spiffe://" case, not the "https://" one