Make linter happy; comment reinterpret_cast safety

Author: jagerman

include/pybind11/pytypes.h

@@ -1090,6 +1090,7 @@ class str : public object {
     str(std::string_view s) : str(s.data(), s.size()) { }
 
 # ifdef PYBIND11_HAS_U8STRING
+    // reinterpret_cast here is safe (C++20 guarantees char8_t has the same size/alignment as char)
     // NOLINTNEXTLINE(google-explicit-constructor)
     str(std::u8string_view s) : str(reinterpret_cast<const char*>(s.data()), s.size()) { }
 # endif
@@ -1186,6 +1187,7 @@ class bytes : public object {
     // Obtain a string view that views the current `bytes` buffer value.  Note that this is only
     // valid so long as the `bytes` instance remains alive and so generally should not outlive the
     // lifetime of the `bytes` instance.
+    // NOLINTNEXTLINE(google-explicit-constructor)
     operator std::string_view() const {
         char *buffer = nullptr;
         ssize_t length = 0;