Fixed xtl version on azure pipelines

Author: JohanMabille

.azure-pipelines/azure-pipelines-win.yml

@@ -37,7 +37,7 @@ jobs:
           conda install cmake==3.14.0 ^
                         ninja ^
                         nlohmann_json ^
-                        xtl==0.6.22 ^
+                        xtl==0.6.23 ^
                         xsimd==7.4.8 ^
                         python=3.6
           conda list