`feature(extract_if)` was stabilized in Rust 1.87.0 [1].

Thus update the comment to reflect that.

Alternatively, we could use it unstably already.

Link: https://github.com/rust-lang/rust/pull/137109 [1]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
 rust/macros/kunit.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rust/macros/kunit.rs b/rust/macros/kunit.rs
index 6be880d634e2..6f6d746b8dbb 100644
--- a/rust/macros/kunit.rs
+++ b/rust/macros/kunit.rs
@@ -87,7 +87,7 @@ pub(crate) fn kunit_tests(test_suite: Ident, mut module: ItemMod) -> Result<Toke
             continue;
         };
 
-        // TODO: Replace below with `extract_if` when MSRV is bumped above 1.85.
+        // TODO: Replace with `extract_if` when MSRV is >= 1.87.0.
         let before_len = f.attrs.len();
         f.attrs.retain(|attr| !attr.path().is_ident("test"));
         if f.attrs.len() == before_len {
-- 
2.53.0