Cocotb: Relese cocotb 1.5.0

[imphil]

Milestone: https://github.com/cocotb/cocotb/milestone/15

Release process checklist:

• [x] Close all issues blocking the milestone
• [x] prepare RC release
• [x] prepare release announcement email
• [x] tag release
• [x] test release build on PyPi
• [x] send out announcement to mailing list

[imphil]

I'm planning to do 1.5.0rc1 on Monday, please either get the remaining docs PRs in by then, or they'll need to wait until the next release.
CC @cmarqu

[ktbarrett]

Don't forget to run towncrier!

[cmarqu]

https://github.com/cocotb/cocotb/wiki/Release-Process - needs a bit of clean up, but towncrier is listed.

[imphil]

I just pushed rc2 containing a single fix, let's give it a week until March 11 to see if something major comes up and do the release otherwise.

[ktbarrett]

Guess it's too late to merge #2426?

[imphil]

No problem at all, RCs are cheap. Merge it, and I'll do another one tomorrow.

[imphil]

1.5.0 is out now.