BUG: Fix metadata:plugin_dependencies parsing

[T4mmi]

Description

When writing a plugin, adding multiple values to the plugin_depencies field of the metadata.txt raises false positive errors when whitespaces are inserted in the line. One is supposed to split dependencies using a , comma, but if whitespaces are inserted (which is the 'standard' syntax ... at least in python with pip) it missread the name (false leading/trailling whitespaces).

This patch only commits a .strip() addition to the name and version parsed

Exemple

current behavior:
plugin_dependencies = Plugin Reloader, QRestart # fails
plugin_dependencies = Plugin Reloader,QRestart # success

patched behavior:
plugin_dependencies = Plugin Reloader, QRestart # success
plugin_dependencies = Plugin Reloader,QRestart # success

[github-actions]

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[nyalldawson]

@T4mmi there's a number of failing tests as a result of this, can you check please?

[T4mmi]

Hi, I'll try ... it seems that providers test fails which is weired to me since I don't touch any of these parts :s
not used to github workflows and QGIS contribution beginner here

[github-actions]

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