Add PyPi emoji

[dannymidnight]

Description

Add new emoji for PyPi and by extension pip.

https://pypi.org/project/pip/

PR checklist

• [X] The image is 64x64 PNG image
• [X] Image is added to img-buildkite-64 directory
• [X] Image is referenced in img-buildkite-64.json file
• [X] Image is referenced in README markdown file
• [X] The image can be hosted by Buildkite and made available in Buildkite UI