Bump libs/EXTERNAL/libezgl from b6beef9 to 5b1fd68

Bumps [libs/EXTERNAL/libezgl](https://github.com/verilog-to-routing/ezgl) from `b6beef9` to `5b1fd68`.
- [Release notes](https://github.com/verilog-to-routing/ezgl/releases)
- [Commits](verilog-to-routing/ezgl@b6beef9...5b1fd68)

---
updated-dependencies:
- dependency-name: libs/EXTERNAL/libezgl
  dependency-version: 5b1fd681c7bfb7ecfe7669557ab44af6f2d04667
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]