tests: pin pytest 7.3.1 to avoid adverse testpaths behavior

pytest 7.3.2 changed treatment of `testpaths` config which forced
test/unittest/conftest.py module load in our integration-tests
toxenv. Upstream bug is tracking their planned revert/fix for this
regression. Pin 7.3.1 in the meantime.

Fixes canonical#4183

integration-requirements.txt

@@ -2,5 +2,11 @@
 # https://cloudinit.readthedocs.io/en/latest/topics/integration_tests.html
 #
 pycloudlib==1!3.0.2
-pytest
+
+# Await pytest > 7.3.2. Breaking change in `testpaths` treatment forced
+# test/unittests/conftest.py to be loaded by our integration-tests tox env
+# resulting in an unmet dependency issue:
+# https://github.com/pytest-dev/pytest/issues/11104
+pytest==7.3.1
+
 packaging

test-requirements.txt

@@ -1,5 +1,11 @@
 # Needed generally in tests
-pytest
+
+# Await pytest > 7.3.2. Breaking change in `testpaths` treatment forced
+# test/unittests/conftest.py to be loaded by our integration-tests tox env
+# resulting in an unmet dependency issue:
+# https://github.com/pytest-dev/pytest/issues/11104
+pytest==7.3.1
+
 pytest-cov
 pytest-mock