fix string formatting in error message

[jameslamb]

Thanks for this awesome project!

I noticed tonight that an error message is printing with the literal string f{lib_path} in it, like this:

delocate.libsana.DelocationError: f{lib_path} already exists in wheel but need to copy /opt/homebrew/Cellar/libomp/17.0.6/lib/libomp.dylib

I strongly suspect that was supposed to be an f-string, where {lib_path} is replaced in the error message with a path to a library.

This proposes that fix.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.93%. Comparing base (7f46f89) to head (e4c8b64).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #216 +/- ## ======================================= Coverage 96.93% 96.93% ======================================= Files 16 16 Lines 1307 1307 ======================================= Hits 1267 1267 Misses 40 40 ```

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[HexDecimal]

I apologize for getting around to this PR so late. I've rebased the PR and updated the changelog and the relevant tests. Tests for DelocationError were missing a match= argument.

[jameslamb]

No problem, and thanks very much!