[Snyk] Security upgrade kramdown from 2.3.1 to 2.5.1

[sayantan300]

Snyk has created this PR to fix 7 vulnerabilities in the rubygems dependencies of this project.

Snyk changed the following file(s):

• Gemfile
• Gemfile.lock

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Uncontrolled Resource Consumption ('Resource Exhaustion') SNYK-RUBY-REXML-7577227	666
	Improper Restriction of XML External Entity Reference ('XXE') SNYK-RUBY-REXML-7814166	624
	Denial of Service (DoS) SNYK-RUBY-REXML-7577228	559
	Regular Expression Denial of Service (ReDoS) SNYK-RUBY-REXML-8309365	559
	Uncontrolled Resource Consumption SNYK-RUBY-REXML-6861566	479
	Denial of Service (DoS) SNYK-RUBY-REXML-7462086	479
	Improper Input Validation SNYK-RUBY-REXML-1244518	390

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• Check the changes in this PR to ensure they won't cause issues with your project.
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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Improper Input Validation
🦉 Uncontrolled Resource Consumption