[Snyk] Fix for 6 vulnerabilities

Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
- Gemfile

⚠️ Warning

``` Failed to update the Gemfile.lock, please update manually before merging. ```

Priority Score (*)	Issue	Breaking Change	Exploit Maturity
661/1000 Why? Recently disclosed, Has a fix available, CVSS 7.5	Regular Expression Denial of Service (ReDoS) SNYK-RUBY-LOOFAH-3168317	No	No Known Exploit
591/1000 Why? Recently disclosed, Has a fix available, CVSS 6.1	Cross-site Scripting (XSS) SNYK-RUBY-LOOFAH-3168318	No	No Known Exploit
556/1000 Why? Recently disclosed, Has a fix available, CVSS 5.4	Cross-site Scripting (XSS) SNYK-RUBY-RAILSHTMLSANITIZER-3168316	No	No Known Exploit
661/1000 Why? Recently disclosed, Has a fix available, CVSS 7.5	Regular Expression Denial of Service (ReDoS) SNYK-RUBY-RAILSHTMLSANITIZER-3168646	No	No Known Exploit
698/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 6.1	Cross-site Scripting (XSS) SNYK-RUBY-RAILSHTMLSANITIZER-3168647	No	Proof of Concept
496/1000 Why? Recently disclosed, Has a fix available, CVSS 4.2	Cross-site Scripting (XSS) SNYK-RUBY-RAILSHTMLSANITIZER-3168648	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

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