ci: remove pull_request triggers from CodeQL and Semgrep to unblock Dependabot auto-merge#555

MightyPrytanis merged 2 commits intodependabot/npm_and_yarn/apps/lexfiat/vite-8.0.1MightyPrytanis/codebase:dependabot/npm_and_yarn/apps/lexfiat/vite-8.0.1from

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