CI: bump "actions/checkout" to v3 for cross zoo matrix

actions/checkout@v2 is deprecated, accidently it was not updated in our
build definition

diff --git a/.github/workflows/cross-zoo.yml b/.github/workflows/cross-zoo.yml
index e2a5816fa3f137b2806e7212f33f57603d63671e..f2c8d7ad8a4deeee31a2df243560473b0074da59 100644 (file)
--- a/.github/workflows/cross-zoo.yml
+++ b/.github/workflows/cross-zoo.yml
@@ -97,7 +97,7 @@ jobs:
         sudo apt-get -yq --force-yes install \
             gcc-${{ matrix.platform.arch }} \
             ${{ matrix.platform.libs }}
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
 
     - name: install quictls