Install Rust 1.85.0 toolchain for backward compatibility

Co-authored-by: marosset <18291632+marosset@users.noreply.github.com>

Author: Copilot

action.yml

@@ -148,6 +148,7 @@ runs:
       if: ${{ (runner.os == 'Linux') }}
       run: |
         rustup toolchain install 1.81.0
+        rustup toolchain install 1.85.0
       shell: bash
 
     - name: Set up env vars (Linux)
@@ -189,6 +190,7 @@ runs:
       if: ${{ (runner.os == 'Windows') }}
       run: |
         rustup toolchain install 1.81.0
+        rustup toolchain install 1.85.0
       shell: pwsh
 
     - name: Set up env vars (Windows)