message: [vcpkgTools.xml] Verify the version field
diff: @@ -50,6 +50,7 @@ namespace vcpkg::Commands::Fetch
  static constexpr StringLiteral OS_STRING = "linux";
  #endif
  + static const std::string XML_VERSION = "1";
  static const fs::path XML_PATH = paths.scripts / "vcpkgTools.xml";
  const auto maybe_get_string_inside_tags = [](const std::string& input,
  @@ -70,6 +71,7 @@ namespace vcpkg::Commands::Fetch
  return match[1];
  };
  + static const std::regex XML_VERSION_REGEX{R"###(<tools[\s]+version="([^"]+)">)###"};
  static const std::string XML = paths.get_filesystem().read_contents(XML_PATH).value_or_exit(VCPKG_LINE_INFO);
  static const std::regex VERSION_REGEX{R"###(<requiredVersion>([\s\S]*?)</requiredVersion>)###"};
  static const std::regex EXE_RELATIVE_PATH_REGEX{
  @@ -78,6 +80,17 @@ namespace vcpkg::Commands::Fetch
  Strings::format(R"###(<archiveName>([\s\S]*?)</archiveName>)###")};
  static const std::regex URL_REGEX{Strings::format(R"###(<url>([\s\S]*?)</url>)###")};
  + std::smatch match_xml_version;
  + const bool has_xml_version = std::regex_search(XML.cbegin(), XML.cend(), match_xml_version, XML_VERSION_REGEX);
  + Checks::check_exit(
  + VCPKG_LINE_INFO, has_xml_version, "Could not find <tools version=x> in %s", XML_PATH.generic_string());
  + Checks::check_exit(VCPKG_LINE_INFO,
  + XML_VERSION == match_xml_version[1],
  + "Expected %s version: [%s], but was [%s]. Please re-run bootstrap-vcpkg.",
  + XML_PATH.generic_string(),
  + XML_VERSION,
  + match_xml_version[1]);
  +
  const std::regex tool_regex{
  Strings::format(R"###(<tool[\s]+name="%s"[\s]+os="%s">([\s\S]*?)<\/tool>)###", tool, OS_STRING)};
  