use the download link in https://github.com/fmtlib/fmt/releases

Signed-off-by: Kefu Chai <tchaikov@gmail.com>

fmt.spec

@@ -5,7 +5,7 @@ Summary:        Small, safe and fast formatting library for C++
 
 License:        BSD
 URL:            https://github.com/fmtlib/fmt
-Source0:        https://github.com/fmtlib/fmt/archive/%{version}.tar.gz#/%{name}-%{version}.tar.gz
+Source0:        https://github.com/fmtlib/fmt/archive/%{version}.tar.gz
 # See https://github.com/fmtlib/fmt/issues/443 and https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/message/LVKYLDLJVWAVJE4MQVKDO6PYZRD5MCP6/
 Patch1:         doc-build-removed-all-pip-internet-stuff.patch
 Patch3:         doc-build-do-not-create-virtual-environment.patch