Try to fix CI by downgrading the ESP-Rs toolchain

Author: ivmarkov

.github/workflows/ci.yml

@@ -40,9 +40,11 @@ jobs:
 
       - name: Install Rust for Xtensa
         if: matrix.target != 'riscv32imc-esp-espidf'
-        uses: esp-rs/[email protected]
+        uses: esp-rs/[email protected].1
         with:
           default: true
+          version: "1.69.0"
+          buildtargets: ${{ matrix.target }}
 
       - name: Build | Fmt Check
         run: cargo fmt -- --check