[CI] Remove coq-bignums before CI · coq-community/bignums@adc6240

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v2. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

Reference Pshiftl_nat_0 is deprecated since 8.19.

Reference Pshiftl_nat_0 is deprecated since 8.19.

Reference Pshiftl_nat_0 is deprecated since 8.19.

Notation Zis_gcd_for_euclid is deprecated since 8.17.

Notation Zis_gcd_for_euclid is deprecated since 8.17.

Notation Zis_gcd_for_euclid is deprecated since 8.17.

Notation Zis_gcd_for_euclid is deprecated since 8.17.

Reference Pshiftl_nat_S is deprecated since 8.19.

Reference Pshiftl_nat_S is deprecated since 8.19.

Reference Pshiftl_nat_S is deprecated since 8.19.

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