clippy: elide the needless lifetimes of series_patches_to_apply

CI lints with -Dwarnings; the explicit 'a lifetime on
series_patches_to_apply triggers needless_lifetimes and would fail
the gate.

src/deb/local.rs

@@ -961,7 +961,7 @@ fn is_debian_changes(entry: &str) -> bool {
 /// lines never apply; in a `single-debian-patch` tree the ambient
 /// 'debian-changes[-<version>]' entries are dropped (their content stays in
 /// the working tree — `quilt push -a` would refuse them).
-fn series_patches_to_apply<'a>(series_content: &'a str, single_debian_patch: bool) -> Vec<&'a str> {
+fn series_patches_to_apply(series_content: &str, single_debian_patch: bool) -> Vec<&str> {
     series_content
         .lines()
         .map(str::trim)