Fix new Clippy warnings

niri-config/src/lib.rs

@@ -3079,7 +3079,7 @@ impl<S: knuffel::traits::ErrorSpan> knuffel::DecodeScalar<S> for WorkspaceName {
                     ctx.emit_error(DecodeError::unexpected(
                         val,
                         "named workspace",
-                        format!("duplicate named workspace: {}", s),
+                        format!("duplicate named workspace: {s}"),
                     ));
                     return Ok(Self(String::new()));
                 }

niri-config/tests/wiki-parses.rs

@@ -95,8 +95,7 @@ fn wiki_docs_parses() {
             }
         } else if must_fail {
             errors.push(format!(
-                "Expected error parsing wiki KDL code block at {}:{}",
-                filename, line_number
+                "Expected error parsing wiki KDL code block at {filename}:{line_number}",
             ));
         }
     }