Updating libpng to 1.6.45.

Author: EricEngle-NOAA

.github/workflows/MacOS.yml

@@ -66,14 +66,14 @@ jobs:
       uses: actions/cache@v4
       with:
         path: ~/png
-        key: png-${{ runner.os }}-1.6.37-macOS
+        key: png-${{ runner.os }}-1.6.45-macOS
 
     - name: build-png
       if: steps.cache-png.outputs.cache-hit != 'true'
       run: |
-        wget https://github.com/glennrp/libpng/archive/refs/tags/v1.6.37.tar.gz &> /dev/null
-        tar zxf v1.6.37.tar.gz
-        cd libpng-1.6.37
+        wget https://github.com/glennrp/libpng/archive/refs/tags/v1.6.45.tar.gz &> /dev/null
+        tar zxf v1.6.45.tar.gz
+        cd libpng-1.6.45
         mkdir build
         cd build
         cmake .. -DCMAKE_INSTALL_PREFIX=~/png -DCMAKE_C_FLAGS="-Wno-implicit-function-declaration" -DPNG_ARM_NEON=off