Upgrade openapi after subscriptions removal

[jtherrmann]

See #1193

After removing the Subscriptions feature, we've significantly changed our API spec and have removed the need for WKT string validation, which makes much of the work done on #1708 obsolete, so I'm starting over from scratch with this PR.

This PR includes the following changes:

• Upgrade the openapi-core, openapi-spec-validator, and jsonschema packages to their latest versions
• Minor updates to the reference paths in our OpenAPI spec files
• Convert our API endpoints from Flask class-based views to functions decorated with @app.route, which leads to simpler code (in my opinion) and, more importantly, allows us to more easily use the FlaskOpenAPIViewDecorator decorator provided by openapi-core, which in turn allows us to re-implement the following features according to the latest openapi-core interface:
  • Disabling of response validation
  • Custom error formatting

TODO:

• Create an issue for converting the openapi-core pin back to the normal format following the next PyPI release (see the TODO comment in the requirements file)

[jtherrmann]

The cfn-lint package pins jsonschema here (see aws-cloudformation/cfn-lint#2792).

[jtherrmann]

The version conflict should be resolved by the most recent version of cfn-lint.

[jtherrmann]

We can now upgrade the openapi-* and jsonschema packages to their latest versions.

[forrestfwilliams]

From what I can tell, this PR look good. I'm confident in the changes to our configuration YAMLs, the dependabot changes, the changelog, and requirements files.

However, I have not worked with Flask APIs in the past, and thus don't feel good rubber stamping the changes in apps/api/src/hyp3_api/routes.py. Would @jhkennedy or @asjohnston-asf be willing to lend a hand here?

[jhkennedy]

Looks great to me! I like the class to decorator change.