chore: New clippy lints (#6568)

src/blob/blob_tests.rs

@@ -100,7 +100,7 @@ async fn test_create_long_names() {
     let t = TestContext::new().await;
     let s = format!("file.{}", "a".repeat(100));
     let blob = BlobObject::create_and_deduplicate_from_bytes(&t, b"data", &s).unwrap();
-    let blobname = blob.as_name().split('/').last().unwrap();
+    let blobname = blob.as_name().split('/').next_back().unwrap();
     assert!(blobname.len() < 70);
 }
 

src/net/http.rs

@@ -253,7 +253,7 @@ async fn fetch_url(context: &Context, original_url: &str) -> Result<Response> {
                 .headers()
                 .get_all("location")
                 .iter()
-                .last()
+                .next_back()
                 .ok_or_else(|| anyhow!("Redirection doesn't have a target location"))?
                 .to_str()?;
             info!(context, "Following redirect to {}", header);

src/sql.rs

@@ -458,7 +458,9 @@ impl Sql {
     ///   in parallel with other transactions. NB: Creating and modifying temporary tables are also
     ///   allowed with `query_only`, temporary tables aren't visible in other connections, but you
     ///   need to pass `PRAGMA query_only=0;` to SQLite before that:
-    ///     `pragma_update(None, "query_only", "0")`.
+    ///   ```text
+    ///   pragma_update(None, "query_only", "0")
+    ///   ```
     ///   Also temporary tables need to be dropped because the connection is returned to the pool
     ///   then.
     ///