chore: upstream dfinity/icp-cli moved to v1.4.0

[pr-automation-bot-public]

dfinity/icp-cli has moved past the ref the docs are verified against.

Pinned in .sources/upstream.json	v1.3.0
Latest release	v1.4.0
Compare	dfinity/icp-cli@v1.3.0...v1.4.0
Published reference	https://cli.internetcomputer.org/

What to re-check

Every icp command and flag in docs/. A new minor also moves the cli.internetcomputer.org link slug (AGENTS.md 'Linking rules'), so check the slug procedure in .agents/upstream-tracking.md when the minor changes.

docs/reference/cli.md

75 line(s) added, 6 removed.

New sections:

• ## icp completions``
• ## icp message``
• ## icp message send``
• ###### **Subcommands:**
• ###### **Arguments:**
• ###### **Arguments:**
• ###### **Options:**

Full diff:

diff <(curl -sL https://raw.githubusercontent.com/dfinity/icp-cli/v1.3.0/docs/reference/cli.md) \
     <(curl -sL https://raw.githubusercontent.com/dfinity/icp-cli/v1.4.0/docs/reference/cli.md)

How to close this

1. Review the changes above against the pages named under "What to re-check".
2. Update those pages if anything they state has changed.
3. Set pinned to v1.4.0 in .sources/upstream.json in the same PR.

If nothing in the docs is affected, bump the pin on its own and say so in the PR.

Procedure: .agents/upstream-tracking.md