envoy: 1.31.1 -> 1.31.2 (#343260)

    # However, the version string is more useful for end-users.

    # These are contained in a attrset of their own to make it obvious that

    # people should update both.

    version = "1.31.1";

    rev = "1f44388cee449c9dae8ae34c0b4f09036bcbf560";

    hash = "sha256-XvlF3hMS2PH87HgFwKoFzxHDYgRjZmxn02L1aLwYOrY=";

    version = "1.31.2";

    rev = "cc4a75482810de4b84c301d13deb551bd3147339";

    hash = "sha256-mfQpEGLMJV3UKqcUdbhy6/pP1sWut26zjwN6vDE7LmA=";

  };

  # these need to be updated for any changes to fetchAttrs