fixup! OxCaml: setup CI

Author: vouillon

.github/workflows/wasm_of_ocaml.yml

@@ -135,10 +135,6 @@ jobs:
         working-directory: ./wasm_of_ocaml
         run: opam pin . -n --with-version 6.0.1+ox
 
-      - name: Pin ppxlib
-        run: opam pin add ppxlib -n 0.35.0
-        if: matrix.ocaml-compiler != 'ocaml-variants.5.2.0+ox'
-
       - name: Pin specific packages for OxCaml
         run: |
           opam pin add -n https://github.com/vouillon/qcheck.git#oxcaml