Revert "Update the `!include` paths to point to the new release URL."

This reverts commit d729c55c55.

C4_Component.puml

@@ -2,7 +2,7 @@
 !if %variable_exists("RELATIVE_INCLUDE")
   !include ./C4_Container.puml
 !else
-  !include https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/v2.5.0/C4_Container.puml
+  !include https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/master/C4_Container.puml
 !endif
 
 ' Scope: A single container.

C4_Container.puml

@@ -2,7 +2,7 @@
 !if %variable_exists("RELATIVE_INCLUDE")
   !include ./C4_Context.puml
 !else
-  !include https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/v2.5.0/C4_Context.puml
+  !include https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/master/C4_Context.puml
 !endif
 
 ' Scope: A single software system.

C4_Context.puml

@@ -2,7 +2,7 @@
 !if %variable_exists("RELATIVE_INCLUDE")
   !include ./C4.puml
 !else
-  !include https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/v2.5.0/C4.puml
+  !include https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/master/C4.puml
 !endif
 
 ' Scope: A single software system.

C4_Deployment.puml

@@ -2,7 +2,7 @@
 !if %variable_exists("RELATIVE_INCLUDE")
   !include ./C4_Container.puml
 !else
-  !include https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/v2.5.0/C4_Container.puml
+  !include https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/master/C4_Container.puml
 !endif
 
 ' Colors

C4_Dynamic.puml

@@ -2,7 +2,7 @@
 !if %variable_exists("RELATIVE_INCLUDE")
   !include ./C4_Component.puml
 !else
-  !include https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/v2.5.0/C4_Component.puml
+  !include https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/master/C4_Component.puml
 !endif
 
 ' Scope: Interactions in an enterprise, software system or container.