Change to using CPLEX_URL_2210 in GitHub actions (#456)

Author: odow

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
         env:
           SECRET_CPLEX_URL_12100: ${{ secrets.CPLEX_URL_12100 }}
           SECRET_CPLEX_URL_2010: ${{ secrets.CPLEX_URL_2010 }}
-          SECRET_CPLEX_URL_2210: ${{ secrets.SECRET_CPLEX_URL_2210 }}
+          SECRET_CPLEX_URL_2210: ${{ secrets.CPLEX_URL_2210 }}
           CPLEX_VERSION: ${{ matrix.cplex_version }}
       - uses: julia-actions/julia-runtest@v1
       - uses: julia-actions/julia-processcoverage@v1