Find a replacement for stderrlog

[brettcannon]

stderrlog has not been updated in a year and there are minor edge cases in outdated dependencies that could cause a segfault. Better safe than sorry, so probably best to replace the crate with something that's being updated regularly.

[brettcannon]

#216 just updated stderrlog, so hopefully that takes care of this concern. 🤞

[brettcannon]

Nope ☹️ https://github.com/brettcannon/python-launcher/runs/7350209622?check_suite_focus=true#step:6:20

[brettcannon]

https://docs.rs/tracing/latest/tracing/index.html

[carltongibson]

This PR on stderrlog looked promising (in that it addressed the advisory issue) cardoe/stderrlog-rs#46

[brettcannon]

Didn't fix it: https://github.com/brettcannon/python-launcher/actions/runs/3544379737/jobs/5951595747#step:6:18

[brettcannon]

Another possibility: https://crates.io/crates/env_logger