Remove deprecated warning and update license format to latest format (#751)

Author: ykim-akamai

pyproject.toml

@@ -8,7 +8,7 @@ authors = [{ name = "Akamai Technologies Inc.", email = "[email protected]"
 description = "The official command-line interface for interacting with the Linode API."
 readme = "README.md"
 requires-python = ">=3.9"
-license = { text = "BSD-3-Clause" }
+license = "BSD-3-Clause"
 classifiers = []
 dependencies = [
     "openapi3",