fix(src/refs.rs): update lifetime annotations

Suggested by new clippy.

Signed-off-by: Lars Wirzenius <liw@liw.fi>

src/refs.rs

@@ -61,7 +61,7 @@ pub fn branch_from_str(s: &str) -> Result<BranchName, RefError> {
 }
 
 /// Convert a branch name to a [`Qualified`]: `refs/heads/main`.
-pub fn qualified_branch(name: &BranchName) -> Result<Qualified, RefError> {
+pub fn qualified_branch(name: &BranchName) -> Result<Qualified<'_>, RefError> {
     if name.starts_with("refs/") {
         return Err(RefError::RefsInName(name.to_ref_string()));
     }
@@ -85,7 +85,7 @@ pub fn namespaced_branch<'a>(
 }
 
 /// Create a name spaced ref name from a string slice.
-pub fn namespaced_from_str(s: &str) -> Result<Namespaced, RefError> {
+pub fn namespaced_from_str(s: &str) -> Result<Namespaced<'_>, RefError> {
     assert!(s.starts_with("refs/namespaces/"));
     let rs = ref_string(s)?;
     Ok(rs