message: [cgmanifest] correct CommitHashes for catch2 and fmt
diff: "Type": "git",
  "git": {
  "RepositoryUrl": "https://github.com/catchorg/Catch2",
  - "CommitHash": "2f631bb8087a0355d2b23a75a28d936ce237659d"
  + "CommitHash": "c4e3767e265808590986d5db6ca1b5532a7f3d13"
  }
  },
  "DevelopmentDependency": true,
  "Type": "git",
  "git": {
  "RepositoryUrl": "https://github.com/fmtlib/fmt",
  - "CommitHash": "d141cdbeb0fb422a3fb7173b285fd38e0d1772dc"
  + "CommitHash": "b6f4ceaed0a0a24ccf575fab6c56dd50ccf6f1a9"
  }
  },
  "DevelopmentDependency": false,
  