remove set-output usage

Author: hobu

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
       matrix: ${{ steps.set-matrix.outputs.matrix }}
     steps:
     - id: set-matrix
-      run: echo "::set-output name=matrix::{\"include\":[{\"type\":\"amd64\",\"image\":\"amazon/aws-lambda-provided:al2\", \"arch\":\"x86_64\"},{\"type\":\"arm64\",\"image\":\"amazon/aws-lambda-provided:al2.2025.07.17.11-arm64\", \"arch\":\"arm64\"}]  }"
+      run: echo "name=matrix::{\"include\":[{\"type\":\"amd64\",\"image\":\"amazon/aws-lambda-provided:al2\", \"arch\":\"x86_64\"},{\"type\":\"arm64\",\"image\":\"amazon/aws-lambda-provided:al2.2025.07.17.11-arm64\", \"arch\":\"arm64\"}]  }"
 
 
   containers:
@@ -72,8 +72,9 @@ jobs:
           if [[ $GITHUB_REF == refs/tags/* ]]; then
             VERSION=${GITHUB_REF/refs\/tags\//}
           fi
-          echo ::set-output name=BUILD_DATE::$(date -u +'%Y-%m-%dT%H:%M:%SZ')
-          echo ::set-output name=VERSION::${VERSION}
+          BUILD_DATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ')
+          echo "BUILD_DATE=$BUILD_DATE" >> $GITHUB_OUTPUT
+          echo "VERSION=$VERSION" >> $GITHUB_OUTPUT
 
       # Extract metadata (tags, labels) for Docker
       # https://github.com/docker/metadata-action