[Snyk] Security upgrade @slack/bolt from 3.9.0 to 3.15.0

[connorads]

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

Snyk has created this PR to fix one or more vulnerable packages in the `yarn` dependencies of this project.

#### Changes included in this PR - Changes to the following files to upgrade the vulnerable dependencies to a fixed version: - package.json - yarn.lock #### Note for [zero-installs](https://yarnpkg.com/features/zero-installs) users If you are using the Yarn feature [zero-installs](https://yarnpkg.com/features/zero-installs) that was introduced in Yarn V2, note that this PR does not update the `.yarn/cache/` directory meaning this code cannot be pulled and immediately developed on as one would expect for a zero-install project - you will need to run `yarn` to update the contents of the `./yarn/cache` directory. If you are not using zero-install you can ignore this as your flow should likely be unchanged. #### Vulnerabilities that will be fixed ##### With an upgrade: Severity | Priority Score (*) | Issue | Breaking Change | Exploit Maturity :-------------------------:|-------------------------|:-------------------------|:-------------------------|:-------------------------  | **676/1000**
**Why?** Proof of Concept exploit, Has a fix available, CVSS 7.1 | Cross-site Request Forgery (CSRF)
[SNYK-JS-AXIOS-6032459](https://snyk.io/vuln/SNYK-JS-AXIOS-6032459) | No | Proof of Concept (*) Note that the real score may have changed since the PR was raised. Check the changes in this PR to ensure they won't cause issues with your project. ------------ **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/connorads/project/ec89874b-1e77-4a5f-860a-373978f1c449?utm_source=github&utm_medium=referral&page=fix-pr) 🛠 [Adjust project settings](https://app.snyk.io/org/connorads/project/ec89874b-1e77-4a5f-860a-373978f1c449?utm_source=github&utm_medium=referral&page=fix-pr/settings) 📚 [Read more about Snyk's upgrade and patch logic](https://support.snyk.io/hc/en-us/articles/360003891078-Snyk-patches-to-fix-vulnerabilities) [//]: # (snyk:metadata:{"prId":"f04fc53f-5887-4aeb-afe3-50aa60b65ef0","prPublicId":"f04fc53f-5887-4aeb-afe3-50aa60b65ef0","dependencies":[{"name":"@slack/bolt","from":"3.9.0","to":"3.15.0"}],"packageManager":"yarn","projectPublicId":"ec89874b-1e77-4a5f-860a-373978f1c449","projectUrl":"https://app.snyk.io/org/connorads/project/ec89874b-1e77-4a5f-860a-373978f1c449?utm_source=github&utm_medium=referral&page=fix-pr","type":"auto","patch":[],"vulns":["SNYK-JS-AXIOS-6032459"],"upgrade":["SNYK-JS-AXIOS-6032459"],"isBreakingChange":false,"env":"prod","prType":"fix","templateVariants":["updated-fix-title","priorityScore"],"priorityScoreList":[676],"remediationStrategy":"vuln"}) --- **Learn how to fix vulnerabilities with free interactive lessons:** 🦉 [Cross-site Request Forgery (CSRF)](https://learn.snyk.io/lesson/csrf-attack/?loc=fix-pr)

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