ci: add dependabot and security files

.github/SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+We take the security of VersionTwo seriously. If you believe you have found a security vulnerability, please report it to us as described below.
+
+**Please do not report security vulnerabilities through public GitHub issues.**
+
+Instead, please report them via email to:
+
+```
+maintainers@pandaswhocode.com
+```
+
+You should receive a response within 48 hours. If for some reason you do not, please follow up via email to ensure we received your original message.
+
+Please include the following information in your report:
+
+- Type of issue (e.g. buffer overflow, SQL injection, cross-site scripting, etc.)
+- Full paths of source file(s) related to the manifestation of the issue
+- The location of the affected source code (tag/branch/commit or direct URL)
+- Any special configuration required to reproduce the issue
+- Step-by-step instructions to reproduce the issue
+- Proof-of-concept or exploit code (if possible)
+- Impact of the issue, including how an attacker might exploit it
+
+## Preferred Languages
+
+We prefer all communications to be in English.
+
+## Policy
+
+- We will respond to your report within 48 hours with our evaluation and expected resolution time
+- If you have followed the instructions above, we will not take legal action against you in regard to your report
+- We will keep you informed of the progress towards resolving the issue
+- Once the issue is resolved, we will publicly acknowledge your responsible disclosure, if you wish

.github/dependabot.yml

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+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"