treewide: simplify rev/repo arguments in src

+ use fetchFromGithub where possible

pkgs/applications/version-management/git-and-tools/bump2version/default.nix

@@ -7,7 +7,7 @@ buildPythonApplication rec {
 
   src = fetchFromGitHub {
     owner = "c4urself";
-    repo = "${pname}";
+    repo = pname;
     rev = "refs/tags/v${version}";
     sha256 = "10p7rg569rk3qvzs5kjj17894bqlsg3ihhbln6ciwwfhkfq1kpja";
   };
@@ -16,12 +16,12 @@ buildPythonApplication rec {
   # X's in pytest are git tests which won't run in sandbox
   checkPhase = ''
     pytest tests/ -k 'not usage_string_fork'
-  ''; 
+  '';
 
   meta = with stdenv.lib; {
     description = "Version-bump your software with a single command";
     longDescription = ''
-      A small command line tool to simplify releasing software by updating 
+      A small command line tool to simplify releasing software by updating
       all version strings in your source code by the correct increment.
     '';
     homepage = "https://github.com/c4urself/bump2version";

pkgs/applications/version-management/git-and-tools/ghorg/default.nix

@@ -7,7 +7,7 @@ buildGoModule rec {
   src = fetchFromGitHub {
     owner = "gabrie30";
     repo = "ghorg";
-    rev = "${version}";
+    rev = version;
     sha256 = "0diwndkckv6fga45j9zngizycn5m71r67cziv0zrx6c66ssbj49w";
   };