remove 1.11 testing

Author: penelopeysm

.github/workflows/CI.yml

@@ -27,30 +27,14 @@ jobs:
 
       matrix:
         runner:
-          # Current stable version
-          - version: '1'
-            os: ubuntu-latest
-            num_threads: 2
           # Minimum supported version
           - version: 'min'
             os: ubuntu-latest
             num_threads: 2
-          # Single-threaded
-          - version: '1'
-            os: ubuntu-latest
-            num_threads: 1
           # Minimum supported version, single-threaded
           - version: 'min'
             os: ubuntu-latest
             num_threads: 1
-          # Windows
-          - version: '1'
-            os: windows-latest
-            num_threads: 2
-          # macOS
-          - version: '1'
-            os: macos-latest
-            num_threads: 2
         test_group:
           - Group1
           - Group2