fix: Use table format for license field in pyproject.toml

The newer string format for license (license = "Apache-2.0") requires
setuptools >= 77.0.0. Changed to table format (license = {text = "Apache-2.0"})
to maintain compatibility with setuptools >= 61.0.

Removed license-files field as setuptools automatically includes LICENSE file.

Author: kesmit13

pyproject.toml

@@ -7,8 +7,7 @@ name = "singlestoredb"
 version = "1.15.8"
 description = "Interface to the SingleStoreDB database and workspace management APIs"
 readme = {file = "README.md", content-type = "text/markdown"}
-license = "Apache-2.0"
-license-files = ["LICENSE"]
+license = {text = "Apache-2.0"}
 authors = [
     {name = "SingleStore", email = "[email protected]"}
 ]