Release 3.3.0

[mayeut]

User-facing changes

• [FEATURE] Add '--strip' option to repair (#255)
• [FEATURE] Add manylinux_2_24 policy (#264)
• [FEATURE] Add python 3.9 support (#265)
• [FEATURE] Drop python 3.5 support (#261)

Housekeeping

• The PyPA has adopted the PSF code of conduct (#256)
• Remove unused find_package_dirs function (#267)
• Bump wheel to 0.36.1 (#269)

[mayeut]

@lkollar,

do you see anything else you want in this release ?
I'll go on with the release if you don't.

[lkollar]

No, I think this looks good.

[mayeut]

3.3.0 released.