chore(ci): Refactor semgrep workflow configuration

[jackseceng]

Updated semgrep workflow to simplify permissions and job configuration.

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

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[github-actions]

🔍 Vulnerabilities of jackseceng/linkshort:500

📦 Image Reference jackseceng/linkshort:500

digest	sha256:0cf03c3a9240025376d3bf3722ed72e7f2f81559fe777c106ed2e49687a7a87e
vulnerabilities
platform	linux/amd64
size	128 MB
packages	34

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