Release 0.8.40

• chore: update to latest flux (#627)
• build(deps): bump tokio from 1.19.2 to 1.20.4 (#626)
• build(deps): bump json5 from 2.2.0 to 2.2.2 in /integration (#624)
• build(deps): bump bumpalo from 3.10.0 to 3.12.0 (#625)