ci: update actions/upload-artifact and actions/download-artifact to v4

[hahuja2]

This PR updates actions/upload-artifact and actions/download-artifact to v4 which uses Node 20:

actions/upload-artifact@v3 -> v4: https://github.com/actions/upload-artifact/releases/tag/v4.0.0 actions/download-artifact@v3 -> v4: https://github.com/actions/download-artifact/releases/tag/v4.0.0

[newrelic-php-agent-bot]

Test Suite	Status	Result
Multiverse	:white_check_mark:	9/9 passing
SOAK	:x:	55/56 passing

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 78.72%. Comparing base (85d74db) to head (caca762). Report is 2 commits behind head on dev.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #887 +/- ## ======================================= Coverage 78.72% 78.72% ======================================= Files 193 193 Lines 27214 27214 ======================================= Hits 21423 21423 Misses 5791 5791 ``` | [Flag](https://app.codecov.io/gh/newrelic/newrelic-php-agent/pull/887/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | Coverage Δ | | |---|---|---| | [agent-for-php-7.0](https://app.codecov.io/gh/newrelic/newrelic-php-agent/pull/887/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | `77.45% <ø> (ø)` | | | [agent-for-php-7.1](https://app.codecov.io/gh/newrelic/newrelic-php-agent/pull/887/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | `77.21% <ø> (ø)` | | | [agent-for-php-7.2](https://app.codecov.io/gh/newrelic/newrelic-php-agent/pull/887/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | `78.13% <ø> (ø)` | | | [agent-for-php-7.3](https://app.codecov.io/gh/newrelic/newrelic-php-agent/pull/887/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | `78.15% <ø> (ø)` | | | [agent-for-php-7.4](https://app.codecov.io/gh/newrelic/newrelic-php-agent/pull/887/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | `77.86% <ø> (ø)` | | | [agent-for-php-8.0](https://app.codecov.io/gh/newrelic/newrelic-php-agent/pull/887/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | `77.92% <ø> (ø)` | | | [agent-for-php-8.1](https://app.codecov.io/gh/newrelic/newrelic-php-agent/pull/887/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | `77.91% <ø> (ø)` | | | [agent-for-php-8.2](https://app.codecov.io/gh/newrelic/newrelic-php-agent/pull/887/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | `77.51% <ø> (ø)` | | | [agent-for-php-8.3](https://app.codecov.io/gh/newrelic/newrelic-php-agent/pull/887/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic) | `77.51% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=newrelic#carryforward-flags-in-the-pull-request-comment) to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.