Dynamic message broadcast

I promised this feature almost 2 months ago in #368, so sorry I took so long.

Don't get too excited yet, I'm already working on a possible v5 :)

What's Changed

• Added dynamic message broadcast by @Secreto31126 in #370
• chore(deps): sinon v19 by @renovate in #372
• chore(deps): esbuild v24 by @renovate in #373
• chore(deps): @types/express v5 by @renovate in #377
• chore(deps): all non-major dependencies by @renovate in #365

Full Changelog: 4.0.3...4.1.0