CI: update macOS dependency to install pygame

When there's no pre-compiled package available on macOS, pip
will try to build pygame, and this requires SDL2 headers, so always
install sdl2 prior to installing pygame

Author: dciabrin

.github/workflows/build-and-publish.yaml

@@ -80,15 +80,15 @@ jobs:
         run: |
           brew tap dciabrin/ngdevkit
           brew install python3 --overwrite
-          brew install automake ngdevkit-toolchain zip pkg-config
+          brew install automake ngdevkit-toolchain zip pkg-config sdl2 sdl2_image
           $(brew --prefix python)/libexec/bin/pip install pygame --break-system-packages
 
       - name: Build
         run: ./.github/scripts/build.sh
 
       - name: Install dependencies for ngdevkit-examples
         run: |
-          brew install ngdevkit-gngeo imagemagick sox glew sdl2 sdl2_image
+          brew install ngdevkit-gngeo imagemagick sox glew
           $(brew --prefix python)/libexec/bin/pip install pyyaml --break-system-packages
 
       - name: Test by compiling ngdevkit-examples

.github/workflows/build-tests.yaml

@@ -80,15 +80,15 @@ jobs:
         run: |
           brew tap dciabrin/ngdevkit
           brew install python3 --overwrite
-          brew install automake ngdevkit-toolchain zip pkg-config
+          brew install automake ngdevkit-toolchain zip pkg-config sdl2 sdl2_image
           $(brew --prefix python)/libexec/bin/pip install pygame --break-system-packages
 
       - name: Build
         run: ./.github/scripts/build.sh
 
       - name: Install dependencies for ngdevkit-examples
         run: |
-          brew install ngdevkit-gngeo imagemagick sox glew sdl2 sdl2_image
+          brew install ngdevkit-gngeo imagemagick sox glew
           $(brew --prefix python)/libexec/bin/pip install pyyaml --break-system-packages
 
       - name: Test by compiling ngdevkit-examples