Pin pycapnp to 1.1.0 to prevent breaking change. (#569)

Author: john-michaelburke

pyproject.toml

@@ -5,7 +5,7 @@ readme = "README.md"
 classifiers = []
 requires-python = ">=3.8"
 dynamic = ['version', 'description']
-dependencies = ["PySide2 ~= 5.15.2", "pycapnp ~= 1.1.0"]
+dependencies = ["PySide2 ~= 5.15.2", "pycapnp == 1.1.0"]
 
 [project.optional-dependencies]
 test = [