Update src/literals.h

Co-authored-by: Copilot <[email protected]>

Author: JosePineiro

src/literals.h

@@ -7,8 +7,8 @@ namespace asyncsrv {
 
 static constexpr const char *empty = "";
 
-static const char T_inline[] = "inline";
-static const char T_attachment[] = "attachment; filename=\"%s\"";
+static constexpr const char *T_inline = "inline";
+static constexpr const char *T_attachment = "attachment; filename=\"%s\"";
 
 static constexpr const char *T__opaque = "\", opaque=\"";
 static constexpr const char *T_100_CONTINUE = "100-continue";