Update to ppxlib 0.9 to allow let-operators

[lessp]

Tried to just bump the dependency myself, but seems like there are some changes to the library itself so some type-errors popped out.

[lessp]

info esy 0.7.0-7b2976 (using package.json)
      ocamlc jsx/.brisk_ppx.objs/byte/brisk_ppx.{cmi,cmo,cmt} (exit 2)
(cd /Users/ter/dev/diverse/reason/brisk-reconciler/_esy/default/store/b/brisk_reconciler-aaafa5cc/default && /Users/ter/.esy/3_____________________________________________________________________/i/ocaml-4.8.1000-426898cd/bin/ocamlc.opt -w -40 -w -9 -g -bin-annot -I jsx/.brisk_ppx.objs/byte -I /Users/ter/.esy/3_____________________________________________________________________/i/ocaml-4.8.1000-426898cd/lib/ocaml/compiler-libs -I /Users/ter/.esy/3_____________________________________________________________________/i/opam__s__base-opam__c__v0.13.1-81726cfe/lib/base -I /Users/ter/.esy/3_____________________________________________________________________/i/opam__s__base-opam__c__v0.13.1-81726cfe/lib/base/base_internalhash_types -I /Users/ter/.esy/3_____________________________________________________________________/i/opam__s__base-opam__c__v0.13.1-81726cfe/lib/base/caml -I /Users/ter/.esy/3_____________________________________________________________________/i/opam__s__base-opam__c__v0.13.1-81726cfe/lib/base/shadow_stdlib -I /Users/ter/.esy/3_____________________________________________________________________/i/opam__s__ocaml_compiler_libs-opam__c__v0.12.1-670bfa9d/lib/ocaml-compiler-libs/common -I /Users/ter/.esy/3_____________________________________________________________________/i/opam__s__ocaml_compiler_libs-opam__c__v0.12.1-670bfa9d/lib/ocaml-compiler-libs/shadow -I /Users/ter/.esy/3_____________________________________________________________________/i/opam__s__ocaml_migrate_parsetree-opam__c__1.6.0-d7e7ef59/lib/ocaml-migrate-parsetree -I /Users/ter/.esy/3_____________________________________________________________________/i/opam__s__ppx__derivers-opam__c__1.2.1-c84ca7ae/lib/ppx_derivers -I /Users/ter/.esy/3_____________________________________________________________________/i/opam__s__ppxlib-opam__c__0.12.0-f26a7d1c/lib/ppxlib -I /Users/ter/.esy/3_____________________________________________________________________/i/opam__s__ppxlib-opam__c__0.12.0-f26a7d1c/lib/ppxlib/ast -I /Users/ter/.esy/3_____________________________________________________________________/i/opam__s__ppxlib-opam__c__0.12.0-f26a7d1c/lib/ppxlib/print_diff -I /Users/ter/.esy/3_____________________________________________________________________/i/opam__s__ppxlib-opam__c__0.12.0-f26a7d1c/lib/ppxlib/traverse_builtins -I /Users/ter/.esy/3_____________________________________________________________________/i/opam__s__result-opam__c__1.5-c94f3ce0/lib/result -I /Users/ter/.esy/3_____________________________________________________________________/i/opam__s__sexplib0-opam__c__v0.13.0-fcf6d915/lib/sexplib0 -I /Users/ter/.esy/3_____________________________________________________________________/i/opam__s__stdio-opam__c__v0.13.0-6b3690d7/lib/stdio -no-alias-deps -o jsx/.brisk_ppx.objs/byte/brisk_ppx.cmo -c -impl jsx/brisk_ppx.pp.ml)
File "jsx/brisk_ppx.ml", line 54, characters 46-66:
54 |     | P.Pexp_apply (fn, args) when exists_jsx expr.pexp_attributes ->
                                                   ^^^^^^^^^^^^^^^^^^^^
Error: This expression has type P.attributes = P.attribute list
       but an expression was expected of type (String.t AT.loc * 'a) list
       Type P.attribute = Parsetree.attribute is not compatible with type
         String.t AT.loc * 'a 
error: command failed: 'dune' 'build' '-p' 'brisk-reconciler' (exited with 1)
esy-build-package: exiting with errors above...
error: build failed with exit code: 1

esy: exiting due to errors above

[wokalski]

I see. what a surprise, direct pattern matching on AST causing problems 😂