[libc++][oss-fuzz] Updates C++ version used. (#87531)
This version update allows testing of `std::format` and the chrono
timezone parsing in oss-fuzz.
diff --git a/libcxx/utils/ci/oss-fuzz.sh b/libcxx/utils/ci/oss-fuzz.sh
index e572340..03b59b2 100755
--- a/libcxx/utils/ci/oss-fuzz.sh
+++ b/libcxx/utils/ci/oss-fuzz.sh
@@ -23,7 +23,7 @@
exe="$(basename ${test})"
exe="${exe%.pass.cpp}"
${CXX} ${CXXFLAGS} \
- -std=c++14 \
+ -std=c++20 \
-DLIBCPP_OSS_FUZZ \
-D_LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS \
-nostdinc++ -cxx-isystem ${INSTALL}/include/c++/v1 \
