[19.0][FIX] base_rest_pydantic: remove duplicate installable key

[fsmw]

Issue: #612

Problem:
The __manifest__.py contained a duplicate installable key. One instance was incorrectly nested inside the external_dependencies dict, making the manifest invalid according to the standard Odoo schema.

Fix:

• Removed the nested installable key from external_dependencies
• Moved the remaining installable key to the root dict with proper double quotes
• Bumped version from 18.0.1.0.2 to 18.0.1.0.3

Before:

"external_dependencies": {
    "python": [
        "pydantic>=2.0.0",
    ],
    "installable": False,
},
    "installable": False,
}

After:

"external_dependencies": {
    "python": [
        "pydantic>=2.0.0",
    ],
},
"installable": False,
}

Fixes #612

[lmignon]

@fsmw thank you for the fix. Can you let the version untouched so I can merge your fix. In practice, the version should never be modified by hand. The merge process will take car of it if appropriate.

[lmignon]

Suggested change

	"version": "18.0.1.0.3",
	"version": "18.0.1.0.2",

[fsmw]

Hi @lmignon, thanks for the review! I've removed the version bump as requested. The version stays at 18.0.1.0.2 and the PR now only contains the fix for the duplicate installable key. Ready for re-review.

[fsmw]

CI failure is pre-existing

The CI failure (test with Odoo and test with OCB) is caused by oca_checklog_odoo flagging a StarletteDeprecationWarning from fastapi/testclient.py as an error — this is unrelated to the manifest fix in this PR.

Evidence: the 18.0 branch has the exact same CI failure (run 26630008184):

StarletteDeprecationWarning: Using `httpx` with `starlette.testclient` is deprecated; install `httpx2` instead.

All 24 fastapi tests pass (0 failed, 0 errors). The only "error" is this deprecation warning from the starlette dependency, which oca_checklog_odoo treats as a failure.

This PR only touches base_rest_pydantic/__manifest__.py (removes duplicate installable key, fixes quotes) — the module has installable: False so it is not even installed during testing.

This appears to be a known issue that will need a separate fix in the fastapi addon (updating the starlette/httpx dependency).