build: fix event payload access

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: na
  - task: lint_package_json
    status: na
  - task: lint_repl_help
    status: na
  - task: lint_javascript_src
    status: na
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: na
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: na
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: na
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

---
type: pre_push_report
description: Results of running various checks prior to pushing changes.
report:
  - task: run_javascript_examples
    status: na
  - task: run_c_examples
    status: na
  - task: run_cpp_examples
    status: na
  - task: run_javascript_readme_examples
    status: passed
  - task: run_c_benchmarks
    status: na
  - task: run_cpp_benchmarks
    status: na
  - task: run_fortran_benchmarks
    status: na
  - task: run_javascript_benchmarks
    status: na
  - task: run_julia_benchmarks
    status: na
  - task: run_python_benchmarks
    status: na
  - task: run_r_benchmarks
    status: na
  - task: run_javascript_tests
    status: na
---

Author: Planeshifter

.github/workflows/slash_commands.yml

@@ -63,15 +63,15 @@ jobs:
         with:
           github-token: ${{ secrets.STDLIB_BOT_PAT_REPO_WRITE }}
           script: |
-            const commentBody = github.event.comment.body.trim();
+            const commentBody = context.payload.comment.body.trim();
             const RE_COMMANDS = /^\/stdlib\s+(help|check-files|update-copyright-years|lint-autofix|merge|rebase)$/i;
             const isRecognizedCommand = RE_COMMANDS.test( commentBody );
 
             if ( isRecognizedCommand ) {
               await github.rest.reactions.createForIssueComment({
                 'owner': context.repo.owner,
                 'repo': context.repo.repo,
-                'comment_id': github.event.comment.id,
+                'comment_id': context.payload.comment.id,
                 'content': 'eyes'
               });
             } else {
@@ -83,7 +83,7 @@ jobs:
                 'owner': context.repo.owner,
                 'repo': context.repo.repo,
                 'issue_number': github.event.issue.number,
-                'body': `${quote}\n\n@${github.event.comment.user.login}, slash command not recognized. Please use \`/stdlib help\` to view available commands.`
+                'body': `${quote}\n\n@${context.payload.comment.user.login}, slash command not recognized. Please use \`/stdlib help\` to view available commands.`
               });
             }