lua54-luaexpat: update checksum and distfiles

As per the documentation on the
[homepage](https://matthewwild.co.uk/projects/luaexpat/)
under Download, the source is distributed throught github.

It seems the move was done on version 1.4.0,
versions 1.3.0 and 1.2.0 have been recreated on the github repo.

srcpkgs/lua54-luaexpat/template

@@ -11,8 +11,8 @@ short_desc="${_desc} (5.4.x)"
 maintainer="Duncaen <mail@duncano.de>"
 license="MIT"
 homepage="https://matthewwild.co.uk/projects/luaexpat/"
-distfiles="https://matthewwild.co.uk/projects/luaexpat/luaexpat-${version}.tar.gz"
-checksum=d060397960d87b2c89cf490f330508b7def1a0677bdc120531c571609fc57dc3
+distfiles="https://github.com/lunarmodules/luaexpat/archive/refs/tags/${version}.tar.gz"
+checksum=9906b1ec81ba141f4cd03e2c8f6c633b15e40b3d341c52a1ef97243e521cdce1
 
 post_extract() {
 	cd "${wrksrc}"