ci: fix scheduled security scan

[lavarou]

codeql-action/upload-sarif needs to know where the scanned code was checked out if it has been checked out to a subdir of github.workspace.

[newrelic-php-agent-bot]

Test Suite	Status	Result
Multiverse	✅	7/7 passing
SOAK	❌	61/62 passing

[github-advanced-security]

This pull request sets up GitHub code scanning for this repository. Once the scans have completed and the checks have passed, the analysis results for this pull request branch will appear on this overview. Once you merge this pull request, the 'Security' tab will show more code scanning analysis results (for example, for the default branch). Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results. For more information about GitHub code scanning, check out the documentation.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.61%. Comparing base (0d0f724) to head (0733e1f).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1004      +/-   ##
==========================================
+ Coverage   77.94%   78.61%   +0.66%     
==========================================
  Files         195      196       +1     
  Lines       26325    27069     +744     
==========================================
+ Hits        20520    21280     +760     
+ Misses       5805     5789      -16     

Flag	Coverage Δ
agent-for-php-7.2	78.62% <ø> (?)
agent-for-php-7.3	78.64% <ø> (?)
agent-for-php-7.4	78.34% <ø> (?)
agent-for-php-8.0	78.36% <ø> (?)
agent-for-php-8.1	78.35% <ø> (?)
agent-for-php-8.2	77.94% <ø> (ø)
agent-for-php-8.3	77.94% <ø> (?)

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