magnum-integration: migrate to Conan v2

[valgur]

Requires

• magnum: migrate to Conan v2 #18860

[conan-center-bot]

Conan v1 pipeline ❌

Failure in build 1 (c7148a765b9072c96a7fa67a43af69d575204a1e):

• magnum-integration/2020.06:
  Error running command conan info magnum-integration/2020.06@#ce26d6140179e2e3a521913911731071 --json {jsonName} -pr {profileName}:

  [settings]
  arch=x86_64
  build_type=Release
  compiler=gcc
  compiler.libcxx=libstdc++11
  compiler.version=5
  os=Linux
  [options]
  magnum-integration:shared=False
  
  ...
  openal/1.21.1: WARN: Recipe 'openal/1.21.1' is deprecated in favor of 'openal-soft'. Please, consider changing your requirements.
  ERROR: Conflict in sdl/2.0.20:
      'sdl/2.0.20' requires 'libalsa/1.2.10' while 'openal/1.21.1' requires 'libalsa/1.2.7.2'.
      To fix this conflict you need to override the package 'libalsa' in your root package.
  

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