chore: bump the python package version (#1734)

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python/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "deltalake-python"
-version = "0.11.0"
+version = "0.12.0"
 authors = ["Qingping Hou <dave2008713@gmail.com>", "Will Jones <willjones127@gmail.com>"]
 homepage = "https://github.com/delta-io/delta-rs"
 license = "Apache-2.0"