fix: bump pyproject.toml version to 1.2.0 (was 0.1.1 despite v1.2.0 tag)

The v1.2.0 tag was created with commit 2dd6817 ("bump to v1.2.0") but
pyproject.toml was never actually updated. This caused version-agreement
CI drift: pypi=0.1.1 vs brew/scoop=1.2.0.

Author: DevForge Engineer

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "datamorph-cli"
-version = "0.1.1"
+version = "1.2.0"
 description = "CLI tool for batch converting between data formats (CSV, JSON, YAML, Parquet, Avro, Protobuf) with streaming for large files"
 readme = "README.md"
 requires-python = ">=3.10"