sponsorship: update sponsors 🙏

[jemgillam]

Description

Thank you to all our sponsors, past and present 🙌

Performance impact

Security impact

Checklist

• [ ] My code matches the project's code style and yarn lint:fix passes.
• [ ] I've added tests for the new feature, and yarn test passes.
• [ ] I have detailed the new feature in the relevant documentation.
• [ ] I have added this feature to 'Pending' in the RELEASE_NOTES.md file (if one exists).
• [ ] If this is a breaking change I've explained why.