Switching to python-yaml, as that is actually python-pyyaml.

PKGBUILD

@@ -3,16 +3,16 @@
 _name=falcon
 pkgname=python-falcon
 pkgver=2.0.0
-pkgrel=3
+pkgrel=4
 pkgdesc="Web API framework for building fast and reliable microservices, proxies, and app backends in Python"
 arch=('x86_64')
 url="https://falconframework.org/"
 license=('Apache')
 depends=('python')
 makedepends=('cython' 'python-setuptools')
-checkdepends=('python-msgpack' 'python-mujson' 'python-pyaml'
-'python-rapidjson' 'python-requests' 'python-pytest' 'python-pytest-runner'
-'python-testtools' 'python-ujson')
+checkdepends=('python-msgpack' 'python-mujson' 'python-rapidjson'
+'python-requests' 'python-pytest' 'python-pytest-runner' 'python-testtools'
+'python-ujson' 'python-yaml')
 optdepends=('python-django: for falcon-bench'
             'python-flask: for falcon-bench'
             'python-pecan: for falcon-bench'