clang-format: copy latest and re-format

clang-format-16 has some backwards incompatible changes that require
additional settings for best compatibility and re-running the formatter.
Copy the latest .clang-format from the docs repository and reformat the
repository.

Change-Id: I75f89d2959b0f1338c20d72ad669fbdc1d720835
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/include/multipart_parser.hpp b/include/multipart_parser.hpp
index adeeccb..abc1657 100644
--- a/include/multipart_parser.hpp
+++ b/include/multipart_parser.hpp
@@ -274,8 +274,8 @@
                     // NOLINTNEXTLINE(cppcoreguidelines-pro-bounds-pointer-arithmetic)
                     const char* start = buffer + partDataMark;
                     size_t size = i - partDataMark;
-                    mime_fields.rbegin()->content +=
-                        std::string_view(start, size);
+                    mime_fields.rbegin()->content += std::string_view(start,
+                                                                      size);
                 }
                 index++;
             }