use dune 3.20.1 again because 'latest' is not downloadable via the shell script

Author: sabine

.github/workflows/ci.yml

@@ -35,7 +35,7 @@ jobs:
       - name: Setup Dune
         uses: ocaml-dune/setup-dune@v1
         with:
-          version: latest
+          version: 3.20.1
 
       - name: Checkout Repo
         uses: actions/checkout@v5

.github/workflows/debug-ci.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Setup Dune
         uses: ocaml-dune/setup-dune@v1
         with:
-          version: latest
+          version: 3.20.1
 
       - name: Checkout Repo
         uses: actions/checkout@v5

.github/workflows/scrape.yml

@@ -22,7 +22,7 @@ jobs:
       - name: Setup Dune
         uses: ocaml-dune/setup-dune@v1
         with:
-          version: latest
+          version: 3.20.1
 
       - name: Install system dependencies
         run: sudo apt update && sudo apt-get install libev-dev libonig-dev libcurl4-openssl-dev

.github/workflows/scrape_changelog.yml

@@ -22,7 +22,7 @@ jobs:
       - name: Setup Dune
         uses: ocaml-dune/setup-dune@v1
         with:
-          version: latest
+          version: 3.20.1
 
       - name: Install system dependencies
         run: sudo apt update && sudo apt-get install libev-dev libonig-dev libcurl4-openssl-dev

Dockerfile

@@ -14,7 +14,7 @@ RUN apk -U upgrade && apk add \
     oniguruma-dev \
     openssl-dev
 
-RUN curl -4fsSL https://github.com/ocaml-dune/dune-bin-install/releases/download/v3/install.sh | sh -s latest --install-root /usr --no-update-shell-config
+RUN curl -4fsSL https://github.com/ocaml-dune/dune-bin-install/releases/download/v3/install.sh | sh -s 3.20.1 --install-root /usr --no-update-shell-config
 RUN dune --version
 
 # Build project