fix(xpkg): 0.0.49 and 0.0.50 existed only for linux

Publishing them, I edited the `linux` block and stopped there. `macosx` and
`windows` topped out at 0.0.48, so a mac or Windows consumer asking for 0.0.50
got the same "not found" a genuinely unpublished version produces — while the
Linux job resolving it in the same run said everything was fine.

That asymmetry is what made it hard to see: three CI jobs failed and three
passed on one commit, which reads as a platform bug in the client rather than
as an index missing two rows.

The tarball is the same for all three — a GitHub source archive, no
per-platform artifact — so the entries are identical apart from the platform
key they sit under.

Verified by parsing with lua5.4 and enumerating keys per platform: all three
now end at 0.0.50.

Author: Sunrisepeak

pkgs/x/xpkg.lua

@@ -91,6 +91,20 @@ package = {
             },
         },
         macosx = {
+            ["0.0.50"] = {
+                url    = {
+                    GLOBAL = "https://github.com/openxlings/libxpkg/archive/refs/tags/0.0.50.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/xpkg/releases/download/0.0.50/xpkg-0.0.50.tar.gz",
+                },
+                sha256 = "add16d5c36796b5550f55924dc5eae7a17dcb20a33fd07aa77cd95d0899b3e5e",
+            },
+            ["0.0.49"] = {
+                url    = {
+                    GLOBAL = "https://github.com/openxlings/libxpkg/archive/refs/tags/0.0.49.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/xpkg/releases/download/0.0.49/xpkg-0.0.49.tar.gz",
+                },
+                sha256 = "45f23d16aba01833cc38ad4a2a117ab2646d9c0edad5f4c9eafecc53a70457ff",
+            },
             ["0.0.48"] = {
                 url    = {
                     GLOBAL = "https://github.com/openxlings/libxpkg/archive/refs/tags/0.0.48.tar.gz",
@@ -156,6 +170,20 @@ package = {
             },
         },
         windows = {
+            ["0.0.50"] = {
+                url    = {
+                    GLOBAL = "https://github.com/openxlings/libxpkg/archive/refs/tags/0.0.50.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/xpkg/releases/download/0.0.50/xpkg-0.0.50.tar.gz",
+                },
+                sha256 = "add16d5c36796b5550f55924dc5eae7a17dcb20a33fd07aa77cd95d0899b3e5e",
+            },
+            ["0.0.49"] = {
+                url    = {
+                    GLOBAL = "https://github.com/openxlings/libxpkg/archive/refs/tags/0.0.49.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/xpkg/releases/download/0.0.49/xpkg-0.0.49.tar.gz",
+                },
+                sha256 = "45f23d16aba01833cc38ad4a2a117ab2646d9c0edad5f4c9eafecc53a70457ff",
+            },
             ["0.0.48"] = {
                 url    = {
                     GLOBAL = "https://github.com/openxlings/libxpkg/archive/refs/tags/0.0.48.tar.gz",