Add msgpack dependency for file serving protocol

pyproject.toml

@@ -10,6 +10,7 @@ dependencies = [
     "aiohttp-jinja2>=1.6",
     "jinja2>=3.1.4",
     "textual>=0.66.0",
+    "msgpack>=1.0.8",
 ]
 readme = "README.md"
 requires-python = ">= 3.8"

requirements-dev.lock

@@ -54,6 +54,8 @@ mdit-py-plugins==0.4.1
     # via markdown-it-py
 mdurl==0.1.2
     # via markdown-it-py
+msgpack==1.0.8
+    # via textual-serve
 multidict==6.0.5
     # via aiohttp
     # via yarl

requirements.lock

@@ -40,6 +40,8 @@ mdit-py-plugins==0.4.1
     # via markdown-it-py
 mdurl==0.1.2
     # via markdown-it-py
+msgpack==1.0.8
+    # via textual-serve
 multidict==6.0.5
     # via aiohttp
     # via yarl