Revert "fail-fast: false"

This reverts commit aa2511e.

Author: mkoeppe

.github/workflows/integration-test.yml

@@ -15,7 +15,7 @@ jobs:
   Integration-test:
     runs-on: ubuntu-20.04
     strategy:
-      fail-fast: false
+      fail-fast: true
       matrix:
         python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12-dev"]
     steps:
@@ -48,7 +48,6 @@ jobs:
       SCIPOPTDIR: C:\scipoptdir
     runs-on: windows-latest
     strategy:
-      fail-fast: false
       matrix:
         python-version: ["3.8", "3.9", "3.10", "3.11", "3.12-dev"]
     steps:
@@ -87,7 +86,6 @@ jobs:
   MacOS-test:
     runs-on: macos-latest
     strategy:
-      fail-fast: false
       matrix:
         python-version: ["3.8", "3.9", "3.10", "3.11", "3.12-dev"]
     steps: