ci: bump ocaml/setup-ocaml from 3.4.8 to 3.6.0

Bumps [ocaml/setup-ocaml](https://github.com/ocaml/setup-ocaml) from 3.4.8 to 3.6.0.
- [Release notes](https://github.com/ocaml/setup-ocaml/releases)
- [Commits](ocaml/setup-ocaml@dec6499...fefd9c2)

---
updated-dependencies:
- dependency-name: ocaml/setup-ocaml
  dependency-version: 3.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Set up OCaml
-        uses: ocaml/setup-ocaml@dec6499fef64fc5d7ed43d43a87251b7b1c306f5 # v3
+        uses: ocaml/setup-ocaml@fefd9c240b9d934d5d25aa9c2a8caae6c7b40079 # v3
         with:
           ocaml-compiler: "5.1"
 
@@ -51,7 +51,7 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Set up OCaml
-        uses: ocaml/setup-ocaml@dec6499fef64fc5d7ed43d43a87251b7b1c306f5 # v3
+        uses: ocaml/setup-ocaml@fefd9c240b9d934d5d25aa9c2a8caae6c7b40079 # v3
         with:
           ocaml-compiler: "5.1"
 

.github/workflows/release.yml

@@ -18,7 +18,7 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Set up OCaml
-        uses: ocaml/setup-ocaml@dec6499fef64fc5d7ed43d43a87251b7b1c306f5 # v3
+        uses: ocaml/setup-ocaml@fefd9c240b9d934d5d25aa9c2a8caae6c7b40079 # v3
         with:
           ocaml-compiler: "5.1"