CI(chore): remove explicite pin and deps install

Pinning and installation of the dependency is already done by
setup-ocaml

.github/workflows/compat.yml

@@ -32,7 +32,5 @@ jobs:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
           dune-cache: true
 
-      - run: opam pin -n .
-      - run: opam depext -y containers containers-data containers-thread
       - run: opam install containers containers-data containers-thread --deps-only
       - run: opam exec -- dune build '@install'

.github/workflows/gh-pages.yml

@@ -18,12 +18,6 @@ jobs:
           ocaml-compiler: '4.14.x'
           dune-cache: false
 
-      - name: Pin
-        run: opam pin -n .
-
-      - name: Depext
-        run: opam depext -yt containers containers-data containers-thread
-
       - name: Deps
         run: opam install -d . --deps-only
 

.github/workflows/main.yml

@@ -31,10 +31,6 @@ jobs:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
           dune-cache: true
 
-      - run: opam pin -n .
-
-      - run: opam depext -yt containers containers-data containers-thread
-
       - run: opam install -t containers containers-data containers-thread --deps-only
         if: matrix.os == 'ubuntu-latest'