fix: correct conan export path in build_cross.yml

The repo is checked out into \$GITHUB_WORKSPACE/src (actions/checkout with
path: src), so the conan/corrade recipe is at src/conan/corrade/, not
conan/corrade/. Update both the export path and the cache key hashFiles
pattern accordingly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: leoparente

.github/workflows/build_cross.yml

@@ -119,11 +119,11 @@ jobs:
         uses: actions/cache@v5
         with:
           path: ${{github.workspace}}/src/build/p/
-          key: conan-${{ runner.os }}-${{matrix.arch}}-${{ hashFiles('**/conanfile.py', 'conan/corrade/**') }}
+          key: conan-${{ runner.os }}-${{matrix.arch}}-${{ hashFiles('**/conanfile.py', 'src/conan/corrade/**') }}
           restore-keys: conan-${{ runner.os }}-${{matrix.arch}}-
 
       - name: Export local Corrade recipe
-        run: conan export ${{github.workspace}}/conan/corrade/ --name=corrade --version=cci.20260327
+        run: conan export ${{github.workspace}}/src/conan/corrade/ --name=corrade --version=cci.20260327
 
       - name: Install dependencies
         working-directory: ${{github.workspace}}/src