CI: Add comment to esp-rs toolchain pin to link to the upstream issue filed

Author: tronical

.github/workflows/ci.yaml

@@ -623,7 +623,7 @@ jobs:
                   default: true
                   buildtargets: esp32
                   ldproxy: false
-                  version: "1.88.0"
+                  version: "1.88.0" # Pinned because of https://github.com/esp-rs/rust/issues/266
             - uses: Swatinem/rust-cache@v2
             - name: Build and Test Printer demo
               shell: bash

.github/workflows/nightly_tests.yaml

@@ -24,7 +24,7 @@ jobs:
                   default: true
                   buildtargets: esp32
                   ldproxy: false
-                  version: "1.88.0"
+                  version: "1.88.0" # Pinned because of https://github.com/esp-rs/rust/issues/266
             - uses: Swatinem/rust-cache@v2
             - name: Build and Test Printer demo
               shell: bash