CI: fix failing semgrep-sast job
Detailed Description
Need to set XDG_CONFIG_HOME to something that always exists (e.g. /tmp) -- same as the gitlab-advanced-sast job.
API Changes
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These changes do not modify the API. 
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These changes do modify the API, and are backwards compatible. 
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These changes do modify the API, and are backwards incompatible. 
For examples of changes that do not modify the API and/or are considered backwards (in)compatible, please see the contributing guide.
Justification for Backwards Incompatible Changes
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Review Status
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