[ci] Update 'test-readme-examples' job to use nightly-2021-03-23

diff --git a/.github/workflows/cont_integration.yml b/.github/workflows/cont_integration.yml
index b008092597de5a9693742979864a47d6fb6db504..3ff6feb64a15b117be34eb611eb7d213f4b3915e 100644 (file)
--- a/.github/workflows/cont_integration.yml
+++ b/.github/workflows/cont_integration.yml
@@ -65,7 +65,7 @@ jobs:
             target
           key: ${{ runner.os }}-cargo-test-md-docs-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
       - name: Set default toolchain
-        run: rustup default nightly
+        run: rustup default nightly-2021-03-23
       - name: Set profile
         run: rustup set profile minimal
       - name: Update toolchain