Remove `rockspec:type() == "rockspec"` assertion

[goldenstein64]

I get this warning whenever I install CC:Tweaked

Warning: The function rockspec.type() is no longer necessary and is now deprecated. Please update your plugin to remove calls to this function.

diff --git a/src/luarocks/build/lls-addon.lua b/src/luarocks/build/lls-addon.lua
index f0491dd..093c1bd 100644
--- a/src/luarocks/build/lls-addon.lua
+++ b/src/luarocks/build/lls-addon.lua
@@ -375,8 +375,6 @@ M.installAddon = installAddon
 ---@param noInstall boolean
 ---@return boolean, string?
 function M.run(rockspec, noInstall)
-       assert(rockspec:type() == "rockspec", "argument is not a rockspec")
-
        local env = {
                ABSPATH = cfg.variables["LLSADDON_ABSPATH"],
                LUARCPATH = cfg.variables["LLSADDON_LUARCPATH"],

The only reason I wouldn't patch it now is because there are likely still users of older LuaRocks installations, which don't have this warning and might still need the assertion.