chore: Prepare 5.5.2 release with @contentstack/core ^1.5.1

[reeshika-h]

Bumps @contentstack/core to ^1.5.1, which fixes MODULE_NOT_FOUND / "expression is too dynamic" build failures in bundlers (Next.js/Turbopack, webpack) and native ESM ReferenceErrors from the keep-alive agent setup.

[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
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

💻 Catch issues earlier using the plugins for VS Code, JetBrains IDEs, Visual Studio, and Eclipse.

[github-actions]

🔒 Security Scan Results

ℹ️ Note: Only vulnerabilities with available fixes (upgrades or patches) are counted toward thresholds.

Check Type	Count (with fixes)	Without fixes	Threshold	Result
🔴 Critical Severity	0	0	10	✅ Passed
🟠 High Severity	0	0	25	✅ Passed
🟡 Medium Severity	0	0	500	✅ Passed
🔵 Low Severity	0	0	1000	✅ Passed

⏱️ SLA Breach Summary

✅ No SLA breaches detected. All vulnerabilities are within acceptable time thresholds.

Severity	Breaches (with fixes)	Breaches (no fixes)	SLA Threshold (with/no fixes)	Status
🔴 Critical	0	0	15 / 30 days	✅ Passed
🟠 High	0	0	30 / 120 days	✅ Passed
🟡 Medium	0	0	90 / 365 days	✅ Passed
🔵 Low	0	0	180 / 365 days	✅ Passed

✅ BUILD PASSED - All security checks passed

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟢	Statements	98.89%	984/995
🟢	Branches	96.44%	298/309
🟢	Functions	97.77%	219/224
🟢	Lines	99.36%	937/943

Test suite run success

708 tests passing in 35 suites.

Report generated by 🧪jest coverage report action from 99fb4ad