fix: locking PyQuil==4.13.1 to unblock CI (microsoft#673)

Author: kikomiss

azure-quantum/requirements-quil.txt

@@ -1,4 +1,5 @@
-pyquil>=3.3.2
+# TODO: Locking PyQuil version to 4.13.1 to unblock CI as later versions require Rust toolchain to be installed
+pyquil==4.13.1
 # pyquil-for-azure-quantum 0.0.2 is requiring that azure-quantum <0.26.0
 # See issue https://github.com/microsoft/qdk-python/issues/422
 # After pyquil-for-azure-quantum 0.0.3 is published we can