Maximum size of client_payload in repository_dispatch

When making a dispatches REST call to trigger a repository_dispatch, passing in client_payload with more than ~70KB of data results in a failure with 422 Unprocessable Entity, and the following body:

documentation_url: "",
message: "client_payload is too large."

Can this limit be increased? Say to 1MB?

I’m testing out a rather interesting workflow of making actions publicly triggerable, and would like to upload base64 versions of images, but due to the encoding the biggest image I can submit is just shy of 50KB.
GitHub Pages Site: Image Upload using Github Pages + Github Actions
Source: GitHub - benkaiser/pages-imgur: Image Upload Site - Built with GitHub Pages and GitHub Actions