[libjxl] Fix wasm32-emscripten build (microsoft#38785)

Fixes error during the CMake configuration step caused by the missing
execution of the third-party dependencies fetch script required for
Emscripten in libjxl CMakeLists.txt.
`
CMake Error at third_party/CMakeLists.txt:128 (message):
  Please run

C:/Users/david/vcpkg/buildtrees/libjxl/src/v0.10.2-fef900ea4e.clean/deps.sh
  to fetch the build dependencies.
`
Fix by using libpng provided by vcpkg disabling the bundled libpng
option.

- [x] Changes comply with the [maintainer
guide](https://github.com/microsoft/vcpkg-docs/blob/main/vcpkg/contributing/maintainer-guide.md).
- ~~[ ] SHA512s are updated for each updated download.~~
- ~~[ ] The "supports" clause reflects platforms that may be fixed by
this new version.~~
- ~~[ ] Any fixed [CI
baseline](https://github.com/microsoft/vcpkg/blob/master/scripts/ci.baseline.txt)
entries are removed from that file.~~
- ~~[ ] Any patches that are no longer applied are deleted from the
port's directory.~~
- [x] The version database is fixed by rerunning `./vcpkg x-add-version
--all` and committing the result.
- [x] Only one version is added to each modified port's versions file.

ports/libjxl/portfile.cmake

@@ -45,6 +45,7 @@ vcpkg_cmake_configure(
         -DJPEGXL_ENABLE_TCMALLOC=OFF
         -DBUILD_TESTING=OFF
         -DCMAKE_FIND_PACKAGE_TARGETS_GLOBAL=ON
+        -DJPEGXL_BUNDLE_LIBPNG=OFF
     MAYBE_UNUSED_VARIABLES
         CMAKE_DISABLE_FIND_PACKAGE_GIF
         CMAKE_DISABLE_FIND_PACKAGE_JPEG

ports/libjxl/vcpkg.json

@@ -1,7 +1,7 @@
 {
   "name": "libjxl",
   "version-semver": "0.10.2",
-  "port-version": 2,
+  "port-version": 3,
   "description": "JPEG XL image format reference implementation",
   "homepage": "https://github.com/libjxl/libjxl",
   "license": "BSD-3-Clause",

versions/baseline.json

@@ -4570,7 +4570,7 @@
     },
     "libjxl": {
       "baseline": "0.10.2",
-      "port-version": 2
+      "port-version": 3
     },
     "libkeyfinder": {
       "baseline": "2.2.8",

versions/l-/libjxl.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "d400085f5ae0a78f03ae828d6c51ea9882e80f76",
+      "version-semver": "0.10.2",
+      "port-version": 3
+    },
     {
       "git-tree": "3dc92cfa2158aa56d401920855db77bb200395bf",
       "version-semver": "0.10.2",