chore: update README.md for v1.2.0 (#1706)

Automated update of `README.md` for release v1.2.0

This pull request was created by
[cgrindel/gha_create_release](https://github.com/cgrindel/gha_create_release).

Co-authored-by: cgrindel <[email protected]>

Author: cgrindel-app-token-generator[bot]

README.md

@@ -88,7 +88,7 @@ Add a dependency on `rules_swift_package_manager`.
 
 <!-- BEGIN MODULE SNIPPET -->
 ```python
-bazel_dep(name = "rules_swift_package_manager", version = "1.1.0")
+bazel_dep(name = "rules_swift_package_manager", version = "1.2.0")
 ```
 <!-- END MODULE SNIPPET -->