mixed-precision: update mixedmode base #2289

Job	Run time
build (--disable-openmp, --with-yaml, --enable-deprecated-io)	1m 45s
build (--disable-openmp, --with-yaml, --disable-deprecated-io)	1m 41s
build (--disable-openmp, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	1m 47s
build (--disable-openmp, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	1m 46s
build (--enable-mixed-mode, --with-yaml, --enable-deprecated-io)	1s
build (--enable-mixed-mode, --with-yaml, --disable-deprecated-io)	18s
build (--enable-mixed-mode, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	1m 16s
build (--enable-mixed-mode, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	40s
build (--disable-setting-flags, --with-yaml, --enable-deprecated-io)	1m 46s
build (--disable-setting-flags, --with-yaml, --disable-deprecated-io)	1m 47s
build (--disable-setting-flags, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	1m 48s
build (--disable-setting-flags, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	1m 46s
build (--with-mpi=no, --with-yaml, --enable-deprecated-io)	1s
build (--with-mpi=no, --with-yaml, --disable-deprecated-io)	1s
build (--with-mpi=no, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	1s
build (--with-mpi=no, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	1s
	16m 25s

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