4 packages from hegeldev/hegel-ocaml at 0.17.2

[echoumcp1]

This pull-request concerns:

• hegel.0.17.2: Hegel property-based testing library for OCaml
• ppx_hegel_compat.0.17.2: Internal ppxlib AST shim shared by Hegel's PPX packages
• ppx_hegel_generator.0.17.2: PPX deriver for Hegel generator derivation
• ppx_hegel_test.0.17.2: PPX expander for Hegel test definitions with Antithesis support

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• Homepage: https://github.com/hegeldev/hegel-ocaml
• Source repo: git+https://github.com/hegeldev/hegel-ocaml.git
• Bug tracker: https://github.com/hegeldev/hegel-ocaml/issues

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