tools: improve update-eslint.sh

* Pin version numbers when using `npx`. This means we can be careful
  about updating what we run. (Thinking about the recent eslint-scope
  thing.)
* Add removeNPMAbsolutePaths to get rid of unused fields in package.json
  files. These unused fields can cause unnecessary churn, as at least
  one contains an absolute path that will be different for each
  developer.

PR-URL: #21819
Reviewed-By: Yuta Hiroto <hello@hiroppy.me>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>

Author: Trott

tools/update-eslint.sh

@@ -20,7 +20,10 @@ npm install --no-bin-links --production --no-package-lock eslint-plugin-markdown
 cd ../..
 
 # Use dmn to remove some unneeded files.
-npx dmn -f clean
+npx dmn@1.0.10 -f clean
+# Use removeNPMAbsolutePaths to remove unused data in package.json.
+# This avoids churn as absolute paths can change from one dev to another.
+npx removeNPMAbsolutePaths@1.0.4 .
 
 cd ..
 mv eslint-tmp/node_modules/eslint node_modules/eslint