Align collection "license" with STAC

[soxofaan]

Proposal to fix #592

[m-mohr]

Isn't the whole API specification still pretty much on STAC v1.0? We probably would want to go through all parts of the spec that are STAC related and make it 1.0 and 1.1 compliant.

[soxofaan]

good point

Isn't the whole API specification still pretty much on STAC v1.0?

I'm not sure it's clear that the whole API specification is on STAC v1.0.
For example, the example value for stac_version is 1.1.0

openeo-api/openapi.yaml

Lines 4584 to 4592 in 1881dae

	stac_version:
	type: string
	description: >-
	The [version of the STAC specification](https://github.com/radiantearth/stac-spec/releases),
	which MAY not be equal to the [STAC API version](#tag/EO-Data-Discovery/STAC).
	The openEO API allows for the STAC versions 1.x.x (RECOMMENDED) and 0.9.x (DEPRECATED).
	pattern: '^(0\.9.\d+|1\.\d+.\d+)'
	example: 1.1.0

And the generic "EO Data Discovery" section keeps it generic to 1.x.x

openeo-api/openapi.yaml

Lines 523 to 525 in 1881dae

	The openEO API allows for the
	- STAC versions 1.x.x (RECOMMENDED) and 0.9.x (DEPRECATED), and
	- STAC API versions 1.x.x (RECOMMENDED) and 0.9.x (DEPRECATED).

But indeed, /collections and /collections/{collection_id} indeed explicitly refer to STAC API 1.0.0

openeo-api/openapi.yaml

Line 1259 in 1881dae

This endpoint is compatible with [STAC API 1.0.0 and later](https://stacspec.org) and

side-question: does "STAC API" here actually means what is now referred to as "STAC API", or does it mean just static "STAC"?