Allow httpx>=0.27.0

Author: roekatz

packages/opal-common/requires.txt

@@ -10,5 +10,5 @@ datadog>=0.44.0, <1
 ddtrace>=2.8.1,<3
 certifi>=2023.7.22 # not directly required, pinned by Snyk to avoid a vulnerability
 requests>=2.32.0 # not directly required, pinned by Snyk to avoid a vulnerability
-httpx==0.27.0
+httpx>=0.27.0
 urllib3>=2.2.2 # not directly required, pinned by Snyk to avoid a vulnerability