Change to "pinned" for cibuildwheel dependencies

Using 'latest' causes builds to fall prey to unexpected problems like
today's build breakage due to Pillow release 11.3.0.

Author: mhucka

pyproject.toml

@@ -14,7 +14,7 @@
 
 [tool.cibuildwheel]
 test-extras = "dev"
-dependency-versions = "latest"
+dependency-versions = "pinned"
 # Due to package & module name conflict, temporarily move it away to run tests:
 before-test = "mv {package}/qsimcirq /tmp"
 test-command = "pytest -s -v {package}/qsimcirq_tests/qsimcirq_test.py && mv /tmp/qsimcirq {package}"