CI: upgrade Zig version used for Docker images

Signed-off-by: Stephen Gutekanst <stephen@sourcegraph.com>

Author: Stephen Gutekanst

.github/workflows/docker.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Install Zig
         run: |
           sudo apt install xz-utils
-          sudo sh -c 'wget -c https://ziglang.org/builds/zig-linux-x86_64-0.10.0-dev.2017+a0a2ce92c.tar.xz -O - | tar -xJ --strip-components=1 -C /usr/local/bin'
+          sudo sh -c 'wget -c https://ziglang.org/builds/zig-linux-x86_64-0.10.0-dev.2439+c84f5a5f9.tar.xz -O - | tar -xJ --strip-components=1 -C /usr/local/bin'
       - name: Install Task
         uses: arduino/setup-task@v1
       - name: Build Docker image