Add missing space in httpx requirement (#1210)

Author: jakirkham

continuous_integration/recipe/meta.yaml

@@ -38,7 +38,7 @@ requirements:
     - dask >=2022.3.0,<=2023.7.1
     - pandas >=1.4.0
     - fastapi >=0.92.0
-    - httpx>=0.24.1
+    - httpx >=0.24.1
     - uvicorn >=0.13.4
     - tzlocal >=2.1
     - prompt-toolkit >=3.0.8