Update datadog_checks_dev pin (DataDog#22637)

* update dcd pin

* changelog

Author: steveny91

ddev/changelog.d/22637.added

@@ -0,0 +1 @@
+Update datadog_checks_dev pin

ddev/pyproject.toml

@@ -30,7 +30,7 @@ dependencies = [
     "click~=8.1.6",
     "coverage",
     "datadog-api-client==2.20.0",
-    "datadog-checks-dev[cli]>=35.5.0,<35.6",
+    "datadog-checks-dev[cli]~=35.6",
     "hatch>=1.8.1",
     "httpx",
     "jsonpointer",