Bump Python package versions for 1.7.0 release (#6142)

Bumps the released 1.6.0 packages agent-framework, agent-framework-core, agent-framework-foundry, and agent-framework-openai to 1.7.0, with root continuing to exactly pin agent-framework-core[all]. Bumps the changed prerelease packages agent-framework-a2a, agent-framework-chatkit, agent-framework-declarative, agent-framework-devui, and agent-framework-foundry-hosting to the 260528 date stamp, raises core floors on the packages included in this release, raises Foundry's OpenAI floor alongside OpenAI, and raises ChatKit's openai-chatkit floor to the minimum version required by the current typed API usage. No beta cohort bump was applied; the absent mistal/mistral package was intentionally not bumped because no such package exists in this branch.

python/packages/declarative/agent_framework_declarative/_workflows/_declarative_builder.py

@@ -316,8 +316,7 @@ class DeclarativeWorkflowBuilder:
                 for forbidden in ("else", "default"):
                     if forbidden in action_def:
                         raise ValueError(
-                            f"Action 'ConditionGroup' field '{forbidden}' is not supported; "
-                            "use 'elseActions' instead."
+                            f"Action 'ConditionGroup' field '{forbidden}' is not supported; use 'elseActions' instead."
                         )
                 conditions = action_def.get("conditions", [])
                 for condition_branch in conditions: