ci: use hardcoded names directly due to api is not accessible (#1566)

# What does this PR do?

api resource is not accessible from the runner therefore the the user
name and email should be hardcoded.

Author: hoolioh

.github/workflows/release-proposal-dispatch.yml

@@ -32,8 +32,8 @@ env:
   MAIN_BRANCH: main
   RELEASE_BRANCH: release
   PROPOSAL_BRANCH_PREFIX: release-proposal
-  GIT_USER_NAME: "github-actions[bot]"
-  GIT_USER_EMAIL: "41898282+github-actions[bot]@users.noreply.github.com"
+  GIT_USER_NAME: "dd-octo-sts[bot]"
+  GIT_USER_EMAIL: "200755185+dd-octo-sts[bot]@users.noreply.github.com"
 
 jobs:
   check-proposal-ongoing:
@@ -78,14 +78,9 @@ jobs:
         env:
           GH_TOKEN: ${{ steps.octo-sts.outputs.token }}
         run: |
-          BOT_USER=$(gh api /user)
-          BOT_NAME=$(echo "$BOT_USER" | jq -r '.login')
-          BOT_ID=$(echo "$BOT_USER" | jq -r '.id')
 
-          git config --global user.name "$BOT_NAME"
-          git config --global user.email "${BOT_ID}+${BOT_NAME}@users.noreply.github.com"
-
-          echo "Configured git as: $BOT_NAME <${BOT_ID}+${BOT_NAME}@users.noreply.github.com>"
+          git config --global user.name "$GIT_USER_NAME"
+          git config --global user.email "$GIT_USER_EMAIL"
 
       - name: Merge the main branch into the release branch
         run: |