Fix uses of Dispatch type default generic

[twschiller]

Context

• https://github.com/pixiebrix/pixiebrix-extension/pull/9332#discussion_r1813455878
• The default generic for Dispatch is any which is not type safe and doesn't handle async thunks properly

Discussion

• Consider introducing lint rule to require a type (or overwrite the type to force callsite to provide)

Related Issues/PRs

• https://github.com/pixiebrix/pixiebrix-extension/pull/9341/files