[Conan] Temp. fix for Conan bzip2 requirement.

https://github.com/bincrafters/conan-pcre/commit/e71042946a51c00f45e60c6f1696e3c47198965a

Fixes #2603.

scripts/cmake/ConanSetup.cmake

@@ -66,6 +66,8 @@ if(OGS_BUILD_GUI)
         shapelib/1.3.0@bilke/stable
         libgeotiff/1.4.2@bilke/stable
         qt/5.12.4@bincrafters/stable
+        # Overwrite VTK requirement to match Qt requirement
+        bzip2/1.0.8@conan/stable
     )
     set(CONAN_OPTIONS ${CONAN_OPTIONS}
         vtk:minimal=False