Fix source link in spec file

Author: RKrahl

python-icat.spec

@@ -15,7 +15,7 @@ Url:		$url
 Summary:	$description
 License:	Apache-2.0
 Group:		Development/Libraries/Python
-Source:		https://github.com/icatproject/python-icat/releases/latest/download/python-icat-%{version}.tar.gz
+Source:		https://github.com/icatproject/python-icat/releases/download/%{version}/python-icat-%{version}.tar.gz
 BuildRequires:	python%{pyversfx}-base >= 3.4
 BuildRequires:	python%{pyversfx}-setuptools
 BuildRequires:	fdupes