Update zlib to 1.3.2

Note that the DLL name created by CMake with `BUILD_SHARED_LIBS`
has changed from `zlib1.dll` to `z.dll`. This was caused by the
"Continued rewrite of CMake build [Vollstrecker]" from its
changelog <https://zlib.net/ChangeLog.txt>, and has been reported
in <https://github.com/madler/zlib/issues/1181>.

The MinGW package `libz-mingw-w64-dev` still calls it `libz1.dll`.

.github/workflows/create-release-artifacts.yml

@@ -38,7 +38,7 @@ jobs:
           key: ${{ matrix.arch }}-${{ hashFiles('zlib/**', 'libpng/**') }}
       - name: Build zlib
         if: steps.cache.outputs.cache-hit != 'true'
-        run: | # BUILD_SHARED_LIBS causes the output DLL to be correctly called `zlib1.dll`
+        run: | # BUILD_SHARED_LIBS causes the output DLL to be called `z.dll` as of zlib 1.3.2 (formerly `zlib1.dll`)
           cmake -S zlib -B zbuild -A ${{ matrix.platform }} -Wno-dev -DCMAKE_INSTALL_PREFIX=install_dir -DBUILD_SHARED_LIBS=ON
           cmake --build zbuild --config Release -j
       - name: Install zlib
@@ -61,7 +61,7 @@ jobs:
           cmake --install build --verbose --prefix install_dir --strip
       - name: Package binaries
         run: |
-          Compress-Archive -LiteralPath @("install_dir/bin/rgbasm.exe", "install_dir/bin/rgblink.exe", "install_dir/bin/rgbfix.exe", "install_dir/bin/rgbgfx.exe", "install_dir/bin/zlib1.dll", "install_dir/bin/libpng16.dll") "rgbds-win${{ matrix.bits }}.zip"
+          Compress-Archive -LiteralPath @("install_dir/bin/rgbasm.exe", "install_dir/bin/rgblink.exe", "install_dir/bin/rgbfix.exe", "install_dir/bin/rgbgfx.exe", "install_dir/bin/z.dll", "install_dir/bin/libpng16.dll") "rgbds-win${{ matrix.bits }}.zip"
       - name: Upload Windows binaries
         uses: actions/upload-artifact@v4
         with: