Change selector from aria-label to data-article-date

[koudaiii]

Why

In the case of text, since the content is likely to be changed on a language-by-language basis, labels should be used.

What

change from 'aria-label' to 'data-article-date'

[koudaiii]

[2024/09/02 14:07:46] sakabekodai@~/src/github.com/koudaiii/jp-learn-microsoft-com-update-checker (main)(minikube)
$ npm run test:e2e

> jp-learn-microsoft-com-update-checker@1.2.0 test:e2e
> jest tests/e2e

 PASS  tests/e2e/content.e2e.test.js (9.427 s)
  JP Learn Microsoft.com Update Checker E2E Test
    ✓ should display English update date on Japanese Microsoft Learn page (1341 ms)
    ✓ should not run script on non-ja-jp pages (697 ms)
    ✓ should run script with jp-learn-microsoft-com-update-checker-debug flag (358 ms)

Test Suites: 1 passed, 1 total
Tests:       3 passed, 3 total
Snapshots:   0 total
Time:        9.506 s, estimated 10 s
Ran all test suites matching /tests\/e2e/i.

[2024/09/02 14:07:14] sakabekodai@~/src/github.com/koudaiii/jp-learn-microsoft-com-update-checker (main)(minikube)
$ npm run test:unit

> jp-learn-microsoft-com-update-checker@1.2.0 test:unit
> jest tests/unit

(node:74892) [DEP0040] DeprecationWarning: The `punycode` module is deprecated. Please use a userland alternative instead.
(Use `node --trace-deprecation ...` to show where the warning was created)
 PASS  tests/unit/content.test.js
  URL Check in Content Script
    ✓ should only run script if URL starts with https://learn.microsoft.com/ja-jp/ (3 ms)
    ✓ should not run script if URL does not start with https://learn.microsoft.com/ja-jp/

Test Suites: 1 passed, 1 total
Tests:       2 passed, 2 total
Snapshots:   0 total
Time:        3.208 s

[koudaiii]

ok