Update pyproject.toml of packageopenai-functions-agent-gmail to prevent ModuleOrPackageNotFound error (#25597)

I was trying to add this package using langchain-cli: `langchain app add
openai-functions-agent-gmail`, but when then try to build the whole
project using poetry or pip, it fails with the following
error:`poetry.core.masonry.utils.module.ModuleOrPackageNotFound: No
file/folder found for package openai-functions-agent-gmail`

This was fixed by modifying the pyproject.toml as in this commit

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templates/openai-functions-agent-gmail/pyproject.toml

@@ -6,6 +6,9 @@ authors = [
     "Lance Martin <lance@langchain.dev>",
 ]
 readme = "README.md"
+packages = [
+    { include = "openai-functions-agent" },
+]
 
 [tool.poetry.dependencies]
 python = ">=3.8.1,<4.0"