[Snyk] Security upgrade gatsby-transformer-remark from 5.25.1 to 6.0.0

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 :-------------------------:|-------------------------|:-------------------------|:-------------------------|:------------------------- ![medium severity](https://res.cloudinary.com/snyk/image/upload/w_20,h_20/v1561977819/icon/m.png "medium severity") | **551/1000**
**Why?** Recently disclosed, Has a fix available, CVSS 5.3 | Improper Input Validation
[SNYK-JS-POSTCSS-5926692](https://snyk.io/vuln/SNYK-JS-POSTCSS-5926692) | Yes | No Known Exploit (*) 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/thatcrazyirishguy/project/03293576-d8f5-4649-bb09-dbbff6a1088b?utm_source=github&utm_medium=referral&page=fix-pr) 🛠 [Adjust project settings](https://app.snyk.io/org/thatcrazyirishguy/project/03293576-d8f5-4649-bb09-dbbff6a1088b?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":"17f20318-f3cc-49e2-b7da-c01415b0077b","prPublicId":"17f20318-f3cc-49e2-b7da-c01415b0077b","dependencies":[{"name":"gatsby-transformer-remark","from":"5.25.1","to":"6.0.0"}],"packageManager":"yarn","projectPublicId":"03293576-d8f5-4649-bb09-dbbff6a1088b","projectUrl":"https://app.snyk.io/org/thatcrazyirishguy/project/03293576-d8f5-4649-bb09-dbbff6a1088b?utm_source=github&utm_medium=referral&page=fix-pr","type":"auto","patch":[],"vulns":["SNYK-JS-POSTCSS-5926692"],"upgrade":["SNYK-JS-POSTCSS-5926692"],"isBreakingChange":true,"env":"prod","prType":"fix","templateVariants":["updated-fix-title","priorityScore"],"priorityScoreList":[551],"remediationStrategy":"vuln"}) --- **Learn how to fix vulnerabilities with free interactive lessons:** 🦉 [Improper Input Validation](https://learn.snyk.io/lesson/improper-input-validation/?loc=fix-pr)

darrenbritton / darrenbritton.github.io

[Snyk] Security upgrade gatsby-transformer-remark from 5.25.1 to 6.0.0 #192

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