build(ci): Remove ineffective MinGW-w64 system path caching

The Cache MinGW-w64 Dependencies step attempted to cache system paths
(/usr/lib/gcc/i686-w64-mingw32, /usr/i686-w64-mingw32) which is
problematic due to permission issues with actions/cache when handling
root-owned paths. Additionally, the Install MinGW-w64 Toolchain step
ran unconditionally without checking cache-hit status, making the
cache completely redundant.

Remove the cache step entirely and rely on apt-get install which is
fast enough (~4s at 76MB/s) and reliable.

Author: JohnsterID

.github/workflows/ci.yml

@@ -195,15 +195,6 @@ jobs:
       - name: Checkout Code
         uses: actions/checkout@v4
 
-      - name: Cache MinGW-w64 Dependencies
-        id: cache-mingw-deps
-        uses: actions/cache@v4
-        with:
-          path: |
-            /usr/lib/gcc/i686-w64-mingw32
-            /usr/i686-w64-mingw32
-          key: mingw-w64-deps-${{ runner.os }}-v1
-
       - name: Install MinGW-w64 Toolchain
         run: |
           sudo apt-get update
@@ -292,15 +283,6 @@ jobs:
       - name: Checkout Code
         uses: actions/checkout@v4
 
-      - name: Cache MinGW-w64 Dependencies
-        id: cache-mingw-deps
-        uses: actions/cache@v4
-        with:
-          path: |
-            /usr/lib/gcc/i686-w64-mingw32
-            /usr/i686-w64-mingw32
-          key: mingw-w64-deps-${{ runner.os }}-v1
-
       - name: Install MinGW-w64 Toolchain
         run: |
           sudo apt-get update