Merge rust-bitcoin#5126: Update mutant exclude for lifetime syntax change

80f95b2 Update mutant exclude for lifetime syntax change (Jamil Lambert, PhD)
6133e10 Reword mutant exclude comment (Jamil Lambert, PhD)

Pull request description:

  Two mutant excludes stopped working and caused a timeout in the weekly mutation testing. The lifetimes are now elided to fix a clippy error. And an existing comment needs to be updated in response to a review comment on previous PR.
  
  - Fix the comment for a mutant exclude as a follow up to rust-bitcoin#5094.
  - Change the excludes to match the new syntax and kill the mutants.
  
  Together with rust-bitcoin#5119 Closes rust-bitcoin#5121


ACKs for top commit:
  tcharding:
    ACK 80f95b2
  apoelstra:
    ACK 80f95b2; successfully ran local tests


Tree-SHA512: 547f17a9ab1244467458ce57e2914bd74520401d18c5697812c22921bb078af225e9eaf74f1d3c21efeecfba314d4b9d99fb09994bc573abc8fc36094606144d

Author: apoelstra

.cargo/mutants.toml

@@ -12,7 +12,7 @@ exclude_re = [
     "serde_details::<impl de::Visitor<'_>", # Skip serde mutation tests
     "Iterator", # Mutating operations in an iterator can result in an infinite loop
     "<impl encoding::Decodable for .*>::decoder", # Mutant replacing Default::default() is equivalent to returning new()
-    "<impl encoding::Decoder for .*>::read_limit", # Function is just a cast for optimization.
+    "<impl encoding::Decoder for .*>::read_limit", # Function is for optimization and does not need to be tested.
 
 
     # ----------------------------------Crate-specific exclusions----------------------------------
@@ -46,6 +46,6 @@ exclude_re = [
     "Script<T>::to_hex", # Deprecated
     "ScriptBuf::to_hex", # Deprecated
     "ScriptBuf<T>::to_hex", # Deprecated
-    "<impl Encoder for WitnessEncoder<'a>>::current_chunk", # Replacing the return with Some(vec![]) causes an infinite loop.
-    "<impl Encoder for WitnessEncoder<'a>>::advance", # Replacing the return with true causes an infinite loop.
+    "<impl Encoder for WitnessEncoder<'_>>::current_chunk", # Replacing the return with Some(vec![]) causes an infinite loop.
+    "<impl Encoder for WitnessEncoder<'_>>::advance", # Replacing the return with true causes an infinite loop.
 ]