Fix libpng installation for workflow on Ubuntu 24.04

.github/workflows/build.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     env:
       GAME_VERSION: EMERALD
       GAME_REVISION: 0
@@ -32,8 +32,9 @@ jobs:
           repository: pret/agbcc
 
       - name: Install binutils
-        run: sudo apt install gcc-arm-none-eabi binutils-arm-none-eabi
-        # build-essential, git, and libpng-dev are already installed
+        run: |
+          sudo apt install gcc-arm-none-eabi binutils-arm-none-eabi libpng-dev
+        # build-essential and git are already installed
         # gcc-arm-none-eabi is only needed for the modern build
         # as an alternative to dkP