address reveiew comment

src/google/protobuf/compiler/rust/message.cc

@@ -287,6 +287,9 @@ void UpbGeneratedMessageTraitImpls(Context& ctx, const Descriptor& msg) {
       unsafe impl $pbr$::AssociatedMiniTable for $Msg$ {
         #[inline(always)]
         fn mini_table() -> *const $pbr$::upb_MiniTable {
+          // This is unsafe only for Rust 1.80 and below and thus can be dropped
+          // once our MSRV is 1.81+
+          #[allow(unused_unsafe)]
           unsafe {
             $std$::ptr::addr_of!($minitable$)
           }
@@ -296,6 +299,9 @@ void UpbGeneratedMessageTraitImpls(Context& ctx, const Descriptor& msg) {
       unsafe impl $pbr$::AssociatedMiniTable for $Msg$View<'_> {
         #[inline(always)]
         fn mini_table() -> *const $pbr$::upb_MiniTable {
+          // This is unsafe only for Rust 1.80 and below and thus can be dropped
+          // once our MSRV is 1.81+
+          #[allow(unused_unsafe)]
           unsafe {
             $std$::ptr::addr_of!($minitable$)
           }
@@ -305,6 +311,9 @@ void UpbGeneratedMessageTraitImpls(Context& ctx, const Descriptor& msg) {
       unsafe impl $pbr$::AssociatedMiniTable for $Msg$Mut<'_> {
         #[inline(always)]
         fn mini_table() -> *const $pbr$::upb_MiniTable {
+          // This is unsafe only for Rust 1.80 and below and thus can be dropped
+          // once our MSRV is 1.81+
+          #[allow(unused_unsafe)]
           unsafe {
             $std$::ptr::addr_of!($minitable$)
           }