fix: Update FastAPI and Starlette to fix CVE-2025-62727 (ReDoS vulnerability)

Update fastapi constraint from <0.119.0 to <0.124.0
Update starlette minimum version from >=0.46.2 to >=0.49.1

Closes #3822

Co-authored-by: George Weale <[email protected]>
PiperOrigin-RevId: 840372879

Author: GWeale

pyproject.toml

@@ -30,7 +30,7 @@ dependencies = [
   "anyio>=4.9.0, <5.0.0",                                    # For MCP Session Manager
   "authlib>=1.5.1, <2.0.0",                                  # For RestAPI Tool
   "click>=8.1.8, <9.0.0",                                    # For CLI tools
-  "fastapi>=0.115.0, <0.119.0",                              # FastAPI framework
+  "fastapi>=0.115.0, <0.124.0",                              # FastAPI framework
   "google-api-python-client>=2.157.0, <3.0.0",               # Google API client discovery
   "google-cloud-aiplatform[agent_engines]>=1.125.0, <2.0.0", # For VertexAI integrations, e.g. example store.
   "google-cloud-bigquery-storage>=2.0.0",
@@ -59,7 +59,7 @@ dependencies = [
   "requests>=2.32.4, <3.0.0",
   "sqlalchemy-spanner>=1.14.0",                              # Spanner database session service
   "sqlalchemy>=2.0, <3.0.0",                                 # SQL database ORM
-  "starlette>=0.46.2, <1.0.0",                               # For FastAPI CLI
+  "starlette>=0.49.1, <1.0.0",                               # For FastAPI CLI
   "tenacity>=9.0.0, <10.0.0",                                # For Retry management
   "typing-extensions>=4.5, <5",
   "tzlocal>=5.3, <6.0",                                      # Time zone utilities