ci: Improve clang-format style

Add

AlignConsecutiveDeclarations: true
PointerAlignment: Right

which will produce the style we want with llvm 13.

.clang-format

@@ -4,6 +4,8 @@ AlwaysBreakAfterDefinitionReturnType: All
 BreakBeforeBinaryOperators: None
 BinPackParameters: false
 SpaceAfterCStyleCast: true
+AlignConsecutiveDeclarations: true
+PointerAlignment: Right
 # Our column limit is actually 80, but setting that results in clang-format
 # making a lot of dubious hanging-indent choices; disable it and assume the
 # developer will line wrap appropriately. clang-format will still check