chore: #3614951 Allow installing canvas 1.9.*

Aseef SRrequested to merge
issue/canvas_extjs-3614951:3614951-allow-installing-canvas into 1.x

Canvas 1.9.0 was released on 29 July 2026. The upper bound of the drupal/canvas constraint (<1.9) prevented canvas_extjs from being installed alongside it, even though no API used by this module changed in Canvas 1.9.

Verified against Drupal 11.4.4 + Canvas 1.9.0: the full canvas_extjs test suite passes (51 tests, 517 assertions, 0 failures).

Closes #3614951

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