DEV: Update CI workflows (#15)

Co-authored-by: discoursebuild <build@discourse.org>

.github/workflows/component-tests.yml

@@ -28,7 +28,7 @@ jobs:
         shell: bash
         run: |
           if [ 0 -lt $(find tmp/component/test -type f \( -name "*.js" -or -name "*.es6" \) 2> /dev/null | wc -l) ]; then
-            echo "::set-output name=tests_exist::true"
+            echo "tests_exist=true" >> $GITHUB_OUTPUT
           fi
 
   test:
@@ -94,7 +94,7 @@ jobs:
 
       - name: Get yarn cache directory
         id: yarn-cache-dir
-        run: echo "::set-output name=dir::$(yarn cache dir)"
+        run: echo "dir=$(yarn cache dir)" >> $GITHUB_OUTPUT
 
       - name: Yarn cache
         uses: actions/cache@v3