chore: bump version from 1.1.4 to 1.2.0 (delta-io#3842)

# Description
The description of the main changes of your pull request

# Related Issue(s)
<!---
For example:

- closes #106
--->

# Documentation

<!---
Share links to useful documentation
--->

Author: ion-elgreco

python/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "deltalake-python"
-version = "1.1.4"
+version = "1.2.0"
 authors = [
     "Qingping Hou <dave2008713@gmail.com>",
     "Will Jones <willjones127@gmail.com>",