Semgrep fails to run on MacOS 11 Big Sur

[brendongo]

Describe the bug
When running semgrep installed with pip on MacOS 11 get the following error message:

 [Errno 8] Exec format error: .../semgrep-core

Environment
If not using semgrep.dev: are you running off docker, an official binary, a local build?
macOS BigSur

[brendongo]

Looks like this occurs because pypi thinks the wheel published for Mac_10_14 is incompatible with MacOS 11. This was fixed in pip 20.3 (pypa/pip#9138). Updating pip and reinstalling semgrep should fix this.