Replace std::string_view with absl::string_view

(following the style guide)

PiperOrigin-RevId: 423281085

rs_bindings_from_cc/ast_visitor.cc

diff --git a/rs_bindings_from_cc/ast_visitor.cc b/rs_bindings_from_cc/ast_visitor.cc
index 483cd29..7bcb74f 100644
--- a/rs_bindings_from_cc/ast_visitor.cc
+++ b/rs_bindings_from_cc/ast_visitor.cc
@@ -43,7 +43,7 @@
 
 namespace rs_bindings_from_cc {
 
-constexpr std::string_view kTypeStatusPayloadUrl =
+constexpr absl::string_view kTypeStatusPayloadUrl =
     "type.googleapis.com/devtools.rust.cc_interop.rs_binding_from_cc.type";
 
 // A mapping of C++ standard types to their equivalent Rust types.