build: fix branch and repo environment variables

Author: Planeshifter

.github/workflows/update_pr_copyright_years.yml

@@ -142,8 +142,8 @@ jobs:
         env:
             REPO_GITHUB_TOKEN: ${{ secrets.REPO_GITHUB_TOKEN }}
             USER_NAME: stdlb-bot
-            BRANCH_NAME: ${{ inputs.branch }}
-            REPO_NAME: ${{ inputs.repository }}
+            BRANCH_NAME: ${{ steps.pr-details.outputs.branch }}
+            REPO_NAME: ${{ steps.pr-details.outputs.repository }}
         run: |
           git config --local user.email "82920195+stdlib-bot@users.noreply.github.com"
           git config --local user.name "stdlib-bot"