SDL_mixer: ci: bump actions/checkout

SDL Commits
1 
From 2a4336b7cc0213d977bbb1fd86d7aeacfba00910 Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Sun, 9 Oct 2022 17:53:11 +0200
Subject: [PATCH] ci: bump actions/checkout

---
 .github/workflows/main.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 37b05e2d..e380dd96 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -80,7 +80,7 @@ jobs:
           ninja-build \
           pkg-config \
           ${NULL+}
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
       with:
         submodules: recursive