autofix incomplete version constraints #309

I think we could think about whether errors like

Version requirement is incomplete.

can be made autofixable...?

most obvious examples would be

- #[RequiresPhp('^8.0')]
+ #[RequiresPhp('^8.0.0')]

- #[RequiresPhp('>=8.0')]
+- #[RequiresPhp('>=8.0.0')]

- #[RequiresPhp('>=8')]
+- #[RequiresPhp('>=8.0.0')]

- #[RequiresPhpunit('>=12')]
+- #[RequiresPhpunit('>=12.0.0')]

in which the comparison operator is given, but the version is not 3 digits

see

• Implement AttributeRequiresPhpVersionRule #268
• Check #[RequiresPhpunit] in the same way we check #[RequiresPhp] #308