ci: Use GITHUB_OUTPUT envvar instead of set-output command (#67)

`save-state` and `set-output` commands used in GitHub Actions are deprecated and [GitHub recommends using environment files](https://github.blog/changelog/2023-07-24-github-actions-update-on-save-state-and-set-output-commands/).

This PR updates the usage of `::set-output` to `"$GITHUB_OUTPUT"`

Instructions for envvar usage from GitHub docs:

https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#setting-an-output-parameter

Author: arunsathiya

.github/workflows/reusable_export_pr_details.yml

@@ -71,19 +71,19 @@ jobs:
       # otherwise the parent caller won't see them regardless on how outputs are set.
       - name: "Export Pull Request Number"
         id: prNumber
-        run: echo ::set-output name=prNumber::$(jq -c '.number' ${FILENAME})
+        run: echo prNumber=$(jq -c '.number' ${FILENAME}) >> "$GITHUB_OUTPUT"
       - name: "Export Pull Request Title"
         id: prTitle
-        run: echo ::set-output name=prTitle::$(jq -c '.pull_request.title' ${FILENAME})
+        run: echo prTitle=$(jq -c '.pull_request.title' ${FILENAME}) >> "$GITHUB_OUTPUT"
       - name: "Export Pull Request Body"
         id: prBody
-        run: echo ::set-output name=prBody::$(jq -c '.pull_request.body' ${FILENAME})
+        run: echo prBody=$(jq -c '.pull_request.body' ${FILENAME}) >> "$GITHUB_OUTPUT"
       - name: "Export Pull Request Author"
         id: prAuthor
-        run: echo ::set-output name=prAuthor::$(jq -c '.pull_request.user.login' ${FILENAME})
+        run: echo prAuthor=$(jq -c '.pull_request.user.login' ${FILENAME}) >> "$GITHUB_OUTPUT"
       - name: "Export Pull Request Action"
         id: prAction
-        run: echo ::set-output name=prAction::$(jq -c '.action' ${FILENAME})
+        run: echo prAction=$(jq -c '.action' ${FILENAME}) >> "$GITHUB_OUTPUT"
       - name: "Export Pull Request Merged status"
         id: prIsMerged
-        run: echo ::set-output name=prIsMerged::$(jq -c '.pull_request.merged' ${FILENAME})
+        run: echo prIsMerged=$(jq -c '.pull_request.merged' ${FILENAME}) >> "$GITHUB_OUTPUT"