$ forge deploy
C:\Users\Ankit\OneDrive\Desktop\bitbucket\stayontop\stay-on-top-forge\manifest.yml
41:10 error app must have required property ‘runtime’ valid-document-required
Error: Command failed due to validation error.
Rerunning the command with --verbose may give more details.
Chances are the runtime property in your manifest is missing or has the old sandbox value in it. Since the deprecation of the sandbox environment end of Feb, you are now required to specify a runtime in your manifest file, see Runtimes
I recommend using the latest runtime since 18.x is also being deprecated soon, see https://developer.atlassian.com/platform/forge/changelog/#CHANGE-2208