Exclude Cobalt from cmake-test-posix in ci.yml

.github/workflows/ci.yml

@@ -162,7 +162,7 @@ jobs:
       - name: Configure Boost
         run: |
           mkdir __build__ && cd __build__
-          cmake -DBUILD_TESTING=ON -DBOOST_EXCLUDE_LIBRARIES="lockfree;outcome;process;static_string;url" ..
+          cmake -DBUILD_TESTING=ON -DBOOST_EXCLUDE_LIBRARIES="cobalt;lockfree;outcome;process;static_string;url" ..
 
       - name: Build tests
         run: |