Fix error with undefined symbol "tinystr_macros" at call sites

[sffc]

Sorry... one more release. I think this can be 0.4.1

[sffc]

This fixes the following error when using the macro in another crate:

error[E0433]: failed to resolve: use of undeclared type or module `tinystr_macros`
  --> components/locale/src/lib.rs:64:34
   |
64 |     const X: tinystr::TinyStr8 = tinystr::tinystr8!("hello");
   |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^ use of undeclared type or module `tinystr_macros`
   |
   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)