Revert "The packaging docs apparently discourage license. julian@Airm"

Interesting -- this actually breaks `pip show` showing the license.

There must be some upstream solution to that but let's revert for this
moment until we investigate.

This reverts commit dd7dff6.

Author: Julian

pyproject.toml

@@ -9,6 +9,7 @@ source = "vcs"
 name = "jsonschema"
 description = "An implementation of JSON Schema validation for Python"
 requires-python = ">=3.8"
+license = {text = "MIT"}
 keywords = [
     "validation",
     "data validation",