Invalidate cache to fix FetchContent platform mismatch

The cached build/_deps contains FetchContent dependencies compiled
without -A x64 flag. Adding x64 to cache key forces fresh build of
dependencies with correct platform configuration.

Author: 0xeb

.github/workflows/ci.yml

@@ -35,9 +35,9 @@ jobs:
         uses: actions/cache@v4
         with:
           path: build/_deps
-          key: deps-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('CMakeLists.txt') }}
+          key: deps-${{ runner.os }}-${{ runner.arch }}-x64-${{ hashFiles('CMakeLists.txt') }}
           restore-keys: |
-            deps-${{ runner.os }}-${{ runner.arch }}-
+            deps-${{ runner.os }}-${{ runner.arch }}-x64-
 
       - name: Configure (Unix)
         if: runner.os != 'Windows'