refactor: extract hurl version to a variable

Author: php-coder

.github/workflows/integration-tests.yml

@@ -84,8 +84,9 @@ jobs:
 
       - name: Install Hurl
         run: |
-          DEB=hurl_4.2.0_amd64.deb
-          curl --location --no-progress-meter --remote-name https://github.com/Orange-OpenSource/hurl/releases/download/4.2.0/$DEB
+          VER=4.2.0
+          DEB=hurl_${VER}_amd64.deb
+          curl --location --no-progress-meter --remote-name https://github.com/Orange-OpenSource/hurl/releases/download/$VER/$DEB
           sudo dpkg --install $DEB
 
       - name: Show Hurl version