[new release] ppxlib and ppxlib-bench (0.30.0)

[tmattio]

Standard infrastructure for ppx rewriters

• Project page: https://github.com/ocaml-ppx/ppxlib
• Documentation: https://ocaml-ppx.github.io/ppxlib/

CHANGES:

• Adopt the OCaml Code of Conduct on the repo (Adopt the OCaml Code of Conduct ocaml-ppx/ppxlib#426, @pitag-ha)

• Clean up misleading attribute hints when declared for proper context. (Remove misleading attribute hint ocaml-ppx/ppxlib#425, @ceastlund)

• Ast_pattern now has ebool, pbool helper, and a new map.(Ast_pattern: augment API with ebool, pbool helper, and a new map. ocaml-ppx/ppxlib#402, @Burnleydev1)

• multiple errors are now reported in metaquot. (Metaquot: Embed errors in the AST instead of raising ocaml-ppx/ppxlib#397, @Burnleydev1)

• Add Attribute.declare_with_attr_loc (Add Attribute.declare_with_attr_loc. ocaml-ppx/ppxlib#396, @dvulakh)

• Add "ns" and "res" as reserved namespaces(Add "ns" and "res" as reserved namespaces ocaml-ppx/ppxlib#388, @davesnx)

• Make quoter let binding non-recursive (Make quoter let binding non-recursive ocaml-ppx/ppxlib#401, @sim642)

• Fix failure of 'lift_map_with_context' in traverse by compile-time
  evaluation of 'fst' and 'snd' ( Fix failure of 'lift_map_with_context' in traverse by compile-time evaluation of 'fst' and 'snd' ocaml-ppx/ppxlib#390, @smuenzel)

• Driver: Bias the mapping from magic to version towards the current version,
  as it is usually the common case and it helps when magic numbers are
  ambiguous (such as on development versions) (Bias the mapping from magic to version towards the current version ocaml-ppx/ppxlib#409, @shym)

• Remove unnecessary test dependencies towards base and stdio (Remove unnecessary test dependencies towards base and stdio ocaml-ppx/ppxlib#421, @kit-ty-kate)

• Update description to reflect that ppxlib contains more than a library
  (Update the opam description ocaml-ppx/ppxlib#422, @pitag-ha)

• Add support for OCaml 5.1, excluding OCaml 5.1.0~alpha1 (Add support for OCaml 5.1 ocaml-ppx/ppxlib#428, @shym, @Octachron , @pitag-ha, @panglesd)

• Driver: Fix -locations-check option for coercions with ground (Add support for OCaml 5.1 ocaml-ppx/ppxlib#428, @Octachron)

[mseri]

I fixed the two fixable failures separately. The others seem unrelated