Update name of blocks_in_if_conditions clippy lint

    warning: lint `clippy::blocks_in_if_conditions` has been renamed to `clippy::blocks_in_conditions`
     --> impl/src/lib.rs:2:5
      |
    2 |     clippy::blocks_in_if_conditions,
      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::blocks_in_conditions`
      |
      = note: `#[warn(renamed_and_removed_lints)]` on by default

Author: dtolnay

impl/src/lib.rs

@@ -1,5 +1,5 @@
 #![allow(
-    clippy::blocks_in_if_conditions,
+    clippy::blocks_in_conditions,
     clippy::cast_lossless,
     clippy::cast_possible_truncation,
     clippy::manual_find,