Update all versions to 0.4.0 #3273

Job	Run time
codecov (./packages/autogen-core)	58s
format	51s
lint	51s
codecov (./packages/autogen-magentic-one)	1m 49s
codecov (./packages/autogen-ext)	2m 39s
codecov (./packages/autogen-agentchat)	1m 4s
mypy (./packages/autogen-core)	2m 14s
pyright (./packages/autogen-core)	55s
mypy (./packages/autogen-magentic-one)	1m 3s
test (./packages/autogen-core)	53s
pyright (./packages/autogen-magentic-one)	1m 15s
docs-example-check (./packages/autogen-core)	2m 40s
mypy (./packages/agbench)	53s
test (./packages/autogen-magentic-one)	1m 21s
pyright (./packages/agbench)	54s
mypy (./packages/autogen-ext)	2m 1s
test (./packages/autogen-ext)	2m 44s
pyright (./packages/autogen-ext)	59s
mypy (./packages/autogen-agentchat)	1m 6s
test (./packages/autogen-agentchat)	1m 6s
pyright (./packages/autogen-agentchat)	52s
mypy (./packages/magentic-one-cli)	1m 8s
pyright (./packages/magentic-one-cli)	52s
check-proto-changes-python	1m 4s
docs (./packages/autogen-core)	1m 36s
markdown-code-lint	2m 7s
samples-code-check	55s
	36m 50s

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