Update DigitalOcean image version to 22.04

Changelog for 0.8.25:

Commits
55a5a8d Update cloud-provision in order to update transitive deps. by @alexellis
27496f4 Exclude vendor from gofmt so that CI can pass by @alexellis
33ad999 Use Go 1.21 in CI build by @alexellis
4767821 Update DigitalOcean image by @alexellis
e321cf4 Update README.md by @alexellis
61e6297 Update README.md by @alexellis
4324fd3 Update go-execute to v2 by @alexellis

Changes: 0.8.24...0.8.25

Generated by Derek