[libxpm] update homepage (#38518)

Noticed the homepage Url in this port is broken while updating the
vcpkg.io site.

---------

Co-authored-by: Javier Matos <javiermatos@Javiers-Laptop.local>

ports/libxpm/vcpkg.json

@@ -1,8 +1,9 @@
 {
   "name": "libxpm",
   "version": "3.5.16",
+  "port-version": 1,
   "description": "XPM format pixmap library",
-  "homepage": "https://github.com/freedesktop/libXpm",
+  "homepage": "https://gitlab.freedesktop.org/xorg/lib/libxpm",
   "license": "MIT",
   "supports": "windows | linux",
   "dependencies": [

versions/baseline.json

@@ -5266,7 +5266,7 @@
     },
     "libxpm": {
       "baseline": "3.5.16",
-      "port-version": 0
+      "port-version": 1
     },
     "libxpresent": {
       "baseline": "1.0.0",

versions/l-/libxpm.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "3c8857f61f5ee49bd9b25deac150fc95a47eaf87",
+      "version": "3.5.16",
+      "port-version": 1
+    },
     {
       "git-tree": "ab78e7ef1aa0fd25dfc94278d05e4c1f983aa71a",
       "version": "3.5.16",