Specify bazelisk-version in case bazelisk isn't installed in the CI container

Author: dougthor42

.github/workflows/bazeltest.yml

@@ -26,6 +26,7 @@ jobs:
         bazelisk-cache: true
         disk-cache: ${{ github.workflow }}
         repository-cache: true
+        bazelisk-version: 1.x
       - name: Checkout submodules
         run: git submodule update --init --recursive
       - name: Install requirements
@@ -55,6 +56,7 @@ jobs:
         bazelisk-cache: true
         disk-cache: ${{ github.workflow }}
         repository-cache: true
+        bazelisk-version: 1.x
       - name: Checkout submodules
         run: git submodule update --init --recursive
       - name: Install requirements
@@ -80,6 +82,7 @@ jobs:
         bazelisk-cache: true
         disk-cache: ${{ github.workflow }}
         repository-cache: true
+        bazelisk-version: 1.x
       - name: Checkout submodules
         run: git submodule update --init --recursive
       - name: Install requirements