Update to conan 1.54.0

.gitlab-ci.yml

 
 variables:
-  CONAN_VERSION: "1.53.0"
+  CONAN_VERSION: "1.54.0"
   PYTHON_VERSION: "3.6.13"
 
+workflow:
+  rules:
+    - if: $CI_PIPELINE_SOURCE == "schedule"
+    - if: $CI_PIPELINE_SOURCE == "web"
+    - if: $CI_COMMIT_TAG
+
 stages:
   - build
   - test