fix: update Conan to latest + llvm to 19

Author: aminya

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
           - ubuntu-22.04
           - macos-14
         compiler:
-          - llvm-18
+          - llvm-19
           - gcc-14
         vcvarsall:
           - true
@@ -62,7 +62,7 @@ jobs:
           cmake: true
           ninja: true
           vcpkg: true
-          conan: 2.6.0
+          conan: true
           cppcheck: true
           cmakelang: true
           clang-tidy: true