Update projects.json: retire spring-cloud-task branch 3.1.x

Author: spring-builds

config/projects.json

@@ -57,12 +57,11 @@
     },
     "commercial": {
       "branches": {
-        "scheduled": ["3.3.x", "3.2.x", "3.1.x", "2.4.x"],
+        "scheduled": ["3.3.x", "3.2.x", "2.4.x"],
         "default": ["3.3.x"]
       },
       "jdkVersions": {
         "3.2.x": ["17", "21"],
-        "3.1.x": ["17", "21"],
         "2.4.x": ["8", "11", "17"],
         "3.3.x": ["17", "21", "25"]
       }