Update dependency grunt-webpack to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
grunt-webpack	^7.0.0 → ^8.0.0

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Release Notes

danez/grunt-webpack (grunt-webpack)

v8.0.0

Compare Source

Features

• Drop support for Node.js 18, 19, 20, 21 (32f269a)

BREAKING CHANGES

• Minimum supported Node.js version is now 22.13.0

v7.0.1

Compare Source

Bug Fixes

• Call compiler.close() so webpack writes cache to disk (#​252) (cb78db9)

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Configuration

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: krew.io-source/package-lock.json

npm ERR! code ERESOLVE
npm ERR! ERESOLVE could not resolve
npm ERR! 
npm ERR! While resolving: closure-webpack-plugin@2.6.1
npm ERR! Found: webpack@5.94.0
npm ERR! node_modules/webpack
npm ERR!   webpack@"^5.94.0" from the root project
npm ERR!   peer webpack@"^5.1.0" from terser-webpack-plugin@5.3.10
npm ERR!   node_modules/terser-webpack-plugin
npm ERR!     terser-webpack-plugin@"^5.3.10" from webpack@5.94.0
npm ERR!   1 more (grunt-webpack)
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer webpack@"4.x" from closure-webpack-plugin@2.6.1
npm ERR! node_modules/closure-webpack-plugin
npm ERR!   closure-webpack-plugin@"^2.5.0" from the root project
npm ERR! 
npm ERR! Conflicting peer dependency: webpack@4.47.0
npm ERR! node_modules/webpack
npm ERR!   peer webpack@"4.x" from closure-webpack-plugin@2.6.1
npm ERR!   node_modules/closure-webpack-plugin
npm ERR!     closure-webpack-plugin@"^2.5.0" from the root project
npm ERR! 
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR! 
npm ERR! See /runner/cache/others/npm/eresolve-report.txt for a full report.

npm ERR! A complete log of this run can be found in:
npm ERR!     /runner/cache/others/npm/_logs/2026-06-11T13_08_04_434Z-debug-0.log