put source-repository in a legal position

gbs-downloader.cabal

@@ -53,11 +53,6 @@ copyright:       2023 The Authors
 category:        Network
 build-type:      Simple
 
-source-repository head
-  type:     git
-  location:
-    https://whetstone.private.storage/PrivateStorage/gbs-downloader.git
-
 -- Extra doc files to be distributed with the package, such as a CHANGELOG or a README.
 extra-doc-files:
   CHANGELOG.md
@@ -66,6 +61,11 @@ extra-doc-files:
 -- Extra source files to be distributed with the package, such as examples, or a tutorial module.
 -- extra-source-files:
 
+source-repository head
+  type:     git
+  location:
+    https://whetstone.private.storage/PrivateStorage/gbs-downloader.git
+
 common warnings
   ghc-options: -Wall