update version to 0.1.1 and pin examples to the tag

`v0.1` is an annotated tag, which dora 1.0.1 cannot check out: it records
the tag object's id as the commit hash, then rejects the checkout for
sitting on the peeled commit. `v0.1.1` is lightweight and resolves
straight to the commit.

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "dora-joy"
-version = "0.1"
+version = "0.1.1"
 description = "Dora node publishing a gamepad's axes and buttons"
 readme = "README.md"
 license = { text = "MIT" }