SIL 2.1 won't install via Composer on top of SMW 4.0.2

[hhappel]

Setup and configuration

• MW version. 1.37.6
• PHP version: 8.0.25
• SMW version: 4.0.2
• SIL version: 2.1
• DB (MySQL etc. and version): 5.7.40-43-log

Issue

When adding to composer.local.json:

"mediawiki/semantic-interlanguage-links": "~2.1",

..running composer will yield:

  Problem 1
    - Root composer.json requires mediawiki/semantic-interlanguage-links ~2.1 -> satisfiable by mediawiki/semantic-interlanguage-links[2.1.0].
    - mediawiki/semantic-interlanguage-links 2.1.0 requires mediawiki/semantic-media-wiki ~3.0 -> found mediawiki/semantic-media-wiki[3.0.0, ..., 3.2.3] but it conflicts with your root composer.json require (~4.0).