[Snyk] Security upgrade webpack from 4.20.2 to 4.26.0

[stoikerty]

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 `npm` dependencies of this project.

#### Changes included in this PR - Changes to the following files to upgrade the vulnerable dependencies to a fixed version: - src/packages/dev-toolkit/package.json - src/packages/dev-toolkit/package-lock.json #### Vulnerabilities that will be fixed ##### With an upgrade: Severity | Priority Score (*) | Issue | Breaking Change | Exploit Maturity :-------------------------:|-------------------------|:-------------------------|:-------------------------|:-------------------------  | **661/1000**
**Why?** Recently disclosed, Has a fix available, CVSS 7.5 | Missing Release of Resource after Effective Lifetime
[SNYK-JS-INFLIGHT-6095116](https://snyk.io/vuln/SNYK-JS-INFLIGHT-6095116) | No | No Known Exploit (*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: webpack

The new version differs by 165 commits.

• 04f90c5 4.26.0
• e1df721 Merge pull request #8392 from vkrol/cherry-pick-terser-to-webpack-4
• a818def fix for changed API in terser plugin warningsFilter
• b39abf4 Rename test directories too
• 311a728 Switch from uglifyjs-webpack-plugin to terser-webpack-plugin
• a230148 Merge pull request #8351 from DeTeam/chunk-jsdoc-typo
• 7a0af76 Fix a typo in Chunk#split jsdoc comment
• 2361995 4.25.1
• e2a2016 Merge pull request #8338 from webpack/bugfix/issue-8293
• babe736 replace prefix/postfix even when equal for wrapped context
• dcd0d59 test for #8293
• af123a8 Merge pull request #8334 from webpack/bugfix/lint
• 36eb0bb move azure specific commands to azure-pipelines.yml
• 290094e 4.25.0
• 355590e Merge pull request #8250 from Aladdin-ADD/patch-3
• 0293c3a Merge pull request #8279 from smelukov/support-entry-progress
• 1ea411b Merge pull request #8139 from NaviMarella/FormatManifest
• 4b72635 exclude watch test cases
• e35d084 increase test timeout
• 6be1411 move schema into definitions
• 3d74504 add missing hooks to progress
• 56d8a8f prevent writing the same message multiple times to stderr
• 64e3826 use flags to show different parts of the progress message
• 8c5e74f Merge branch 'master' into support-entry-progress

See the full diff

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