[Snyk] Security upgrade @twilio/flex-plugin-scripts from 6.0.3 to 6.4.0

[twilio-product-security]

This PR was automatically created by Snyk using the credentials of a real user.

 ### Snyk has created this PR to fix 5 vulnerabilities in the npm dependencies of this project. #### Snyk changed the following file(s): - `experimental-flex-dialpad/ui-src/package.json` #### Vulnerabilities that will be fixed with an upgrade: | | Issue | Score | :-------------------------:|:-------------------------|:-------------------------  | Uncontrolled resource consumption
[SNYK-JS-BRACES-6838727](https://snyk.io/vuln/SNYK-JS-BRACES-6838727) |   **169**    | Cross-site Request Forgery (CSRF)
[SNYK-JS-AXIOS-6032459](https://snyk.io/vuln/SNYK-JS-AXIOS-6032459) |   **167**    | Inefficient Regular Expression Complexity
[SNYK-JS-MICROMATCH-6838728](https://snyk.io/vuln/SNYK-JS-MICROMATCH-6838728) |   **124**    | Prototype Pollution
[SNYK-JS-UNSETVALUE-2400660](https://snyk.io/vuln/SNYK-JS-UNSETVALUE-2400660) |   **115**    | Regular Expression Denial of Service (ReDoS)
[SNYK-JS-AXIOS-6124857](https://snyk.io/vuln/SNYK-JS-AXIOS-6124857) |   **67**   --- > [!IMPORTANT] > > - Check the changes in this PR to ensure they won't cause issues with your project. > - Max score is 1000. Note that the real score may have changed since the PR was raised. > - This PR was automatically created by Snyk using the credentials of a real user. --- **Note:** _You are seeing this because you or someone else with access to this repository has authorized Snyk to open fix PRs._ For more information: 🧐 [View latest project report](https://app.snyk.io/org/twilio-labs/project/101f6492-faa4-461f-ae1c-5b1fb442d0c8?utm_source=github-enterprise&utm_medium=referral&page=fix-pr) 📜 [Customise PR templates](https://docs.snyk.io/scan-using-snyk/pull-requests/snyk-fix-pull-or-merge-requests/customize-pr-templates) 🛠 [Adjust project settings](https://app.snyk.io/org/twilio-labs/project/101f6492-faa4-461f-ae1c-5b1fb442d0c8?utm_source=github-enterprise&utm_medium=referral&page=fix-pr/settings) 📚 [Read about Snyk's upgrade logic](https://support.snyk.io/hc/en-us/articles/360003891078-Snyk-patches-to-fix-vulnerabilities) --- **Learn how to fix vulnerabilities with free interactive lessons:** 🦉 [Cross-site Request Forgery (CSRF)](https://learn.snyk.io/lesson/csrf-attack/?loc=fix-pr) 🦉 [Regular Expression Denial of Service (ReDoS)](https://learn.snyk.io/lesson/redos/?loc=fix-pr) 🦉 [Prototype Pollution](https://learn.snyk.io/lesson/prototype-pollution/?loc=fix-pr) [//]: # 'snyk:metadata:{"customTemplate":{"variablesUsed":[],"fieldsUsed":[]},"dependencies":[{"name":"@twilio/flex-plugin-scripts","from":"6.0.3","to":"6.4.0"}],"env":"prod","issuesToFix":[{"exploit_maturity":"Proof of 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