Fix Conan CI: matrix shared value must be capitalized

GitHub Actions stringifies YAML booleans as lowercase true/false in
${{ }} interpolation, but Conan's shared option only accepts True/False.

Author: ArthurSonzogni

.github/workflows/conan.yaml

@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        shared: [false, true]
+        shared: ["False", "True"]
 
     runs-on: ${{ matrix.os }}
     steps: