build: fix srtool build (#671)

* fix: attempt to fix srtool build issue

  ║ error[E0658]: use of unstable library feature 'vec_retain_mut'
  ║ --> /cargo-home/git/checkouts/substrate-7e08433d4c370a21/34a0621/client/transaction-pool/src/graph/validated_pool.rs:207:12
  ║ |
  ║ 207 | sinks.retain_mut(|sink| match sink.try_send(*hash) {
  ║ | ^^^^^^^^^^
  ║ |
  ║ = note: see issue #90829 <rust-lang/rust#90829> for more information
  ║ = help: add `#![feature(vec_retain_mut)]` to the crate attributes to enable

Author: Alex Sedighi

.github/workflows/srtool.yml

@@ -23,7 +23,6 @@ jobs:
           chain: ${{ matrix.runtime }}
           package: runtime-${{ matrix.runtime }}
           runtime_dir: runtimes/${{ matrix.runtime }}
-          tag: 1.60.0
 
       - name: Summary
         run: |