chore: add security policy

* chore: pin GitHub Actions to commit SHAs

* chore: pin GitHub Actions to commit SHAs

.github/SECURITY.md

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+# Security Policy
+
+**PLEASE DON'T DISCLOSE SECURITY-RELATED ISSUES PUBLICLY, [SEE BELOW](#reporting-a-vulnerability).**
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability in Pest, please report it privately using one of the following channels:
+
+1. **GitHub Private Vulnerability Reporting** (preferred) — go to the repository's **Security** tab and click **"Report a vulnerability"**. This creates a private advisory visible only to maintainers and provides a structured workflow for triage, fix coordination, and CVE assignment.
+
+2. **Email** — send the details to Nuno Maduro at **enunomaduro@gmail.com**.
+
+All security vulnerabilities will be promptly addressed.

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    groups:
+      github-actions:
+        patterns:
+          - "*"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    target-branch: "5.x"
+    groups:
+      github-actions:
+        patterns:
+          - "*"