FTBFS with googletest 1.13.0

[sebastinas]

From Debian's #1040998:

In file included from /usr/src/googletest/googletest/include/gtest/gtest-message.h:57,
                 from /usr/src/googletest/googletest/include/gtest/gtest-assertion-result.h:46,
                 from /usr/src/googletest/googletest/include/gtest/gtest.h:64,
                 from /usr/src/googletest/googletest/src/gtest-all.cc:38:
/usr/src/googletest/googletest/include/gtest/internal/gtest-port.h:270:2: error: #error C++ versions less than C++14 are not supported.
  270 | #error C++ versions less than C++14 are not supported.
      |  ^~~~~