update workflows to 5.4.0

Author: zhelih

.github/workflows/ci.yaml

@@ -18,6 +18,7 @@ jobs:
           - 5.2.0
           - 5.2.1
           - 5.3.0
+          - 5.4.0
 
     steps:
       - uses: actions/checkout@v3

.github/workflows/gh-pages.yaml

@@ -17,7 +17,7 @@ jobs:
 
       - uses: ocaml/setup-ocaml@v3
         with:
-          ocaml-compiler: 5.3.0
+          ocaml-compiler: 5.4.0
 
       - name: Install dependencies
         run: |

.github/workflows/release.yaml

@@ -10,7 +10,7 @@ jobs:
     name: Build Artifacts
     runs-on: ubuntu-latest
     env:
-      OCAML_VERSION: 5.3.0
+      OCAML_VERSION: 5.4.0
 
     steps:
       - uses: actions/checkout@v3