[openssl/openssl] 188ffa: ci.yml: Replace actions-rs/toolchain at v1 with dtoln...

[Tomáš Mráz]

  Branch: refs/heads/openssl-3.0
  Home:   https://github.com/openssl/openssl
  Commit: 188ffa6cce00c566ffdc378cf66099af27f311c7
      https://github.com/openssl/openssl/commit/188ffa6cce00c566ffdc378cf66099af27f311c7
  Author: Tomas Mraz <tomas at openssl.org>
  Date:   2024-01-23 (Tue, 23 Jan 2024)

  Changed paths:
    M .github/workflows/ci.yml

  Log Message:
  -----------
  ci.yml: Replace actions-rs/toolchain at v1 with dtolnay/rust-toolchain

actions-rs/toolchain is unmaintained and generates warnings

Reviewed-by: Shane Lontis <shane.lontis at oracle.com>
Reviewed-by: Hugo Landau <hlandau at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/23232)

(cherry picked from commit cd5911a6b300453eefb4b6d9d797c9d1cdefb956)