Remove the deprecated empty matcher.

This is backward-incompatible and will require the next googletest-rust version to increment the minor version.

PiperOrigin-RevId: 776346963

Author: marcianx

googletest/src/matchers/empty_matcher.rs

@@ -42,12 +42,6 @@ pub fn is_empty() -> EmptyMatcher {
     EmptyMatcher
 }
 
-/// This is deprecated. Use `is_empty()` instead.
-#[deprecated(since = "0.14.1", note = "Use `is_empty()` instead.")]
-pub fn empty() -> EmptyMatcher {
-    EmptyMatcher
-}
-
 #[derive(MatcherBase)]
 pub struct EmptyMatcher;
 

googletest/src/matchers/mod.rs

@@ -70,7 +70,7 @@ pub use contains_regex_matcher::contains_regex;
 pub use derefs_to_matcher::derefs_to;
 pub use display_matcher::displays_as;
 pub use each_matcher::each;
-pub use empty_matcher::{empty, is_empty};
+pub use empty_matcher::is_empty;
 pub use eq_matcher::{eq, EqMatcher};
 pub use err_matcher::err;
 pub use ge_matcher::ge;