clang-format: update latest spec and reformat with clang-20

Copy the latest format file from the docs repository and apply using
clang-format-20.

See I1818407fdd8ab2ca11a939ffebd5f3e5445403c3 for clang-20 enablement.

Change-Id: Ibb1a593d259af85c45c337023f2614641a238d58
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/.clang-format b/.clang-format
index a75a2c2..e5530e6 100644
--- a/.clang-format
+++ b/.clang-format
@@ -104,7 +104,7 @@
 PenaltyBreakString: 1000
 PenaltyBreakTemplateDeclaration: 10
 PenaltyExcessCharacter: 1000000
-PenaltyReturnTypeOnItsOwnLine: 60
+PenaltyReturnTypeOnItsOwnLine: 150
 PenaltyIndentedWhitespace: 1
 PointerAlignment: Left
 QualifierAlignment: Left