chore(deps): update dependency plug to v1.18.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
plug (source)	prod	minor	1.16.1 -> 1.18.1

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Release Notes

elixir-plug/plug (plug)

v1.18.1

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Enhancements

• [Plug.Debugger] Do not include code snippets in rendered markdown
• [Plug.RewriteOn] Add support to rewrite nonstandard headers

v1.18.0

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Enhancements

• [Plug.Conn] Define optional get_sock_data/1 and get_ssl_data/1 callbacks
• [Plug.RequestID] Allow metadata key to be customizable
• [Plug.Router] Allow match to dispatch to function plugs

v1.17.0

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Enhancements

• [Plug.Debugger] Add dark mode and other UI improvements
• [Plug.Debugger] Link Module.function/arity to hexdocs in exception messages
• [Plug.Debugger] Support __RELATIVEFILE__ to PLUG_EDITOR replacements
• [Plug.SSL] Add SSL validation support for certs_keys

Deprecations

• [Plug.Conn.Adapter] Make push an optional callback as it is no longer supported by browsers
• [Plug.Conn] Deprecate req_cookies, cookies, and resp_cookies fields in favor of functions
• [Plug.Conn] Deprecate owner field. Tracking responses is now part of adapters
• [Plug.Test] Deprecate use Plug.Test in favor of imports

v1.16.2

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Bug fixes

• Avoid XSS injection in the debug error page

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