Use "administer site configuration" permission instead of "access administration pages"

Problem/Motivation

FILE: /var/www/html/web/modules/custom/fences/fences.routing.yml
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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 7 | WARNING | The administration page callback should probably use "administer site configuration" - which implies the user can change something - rather than "access administration pages" which is about viewing but not changing configurations.
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Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes