dbus/1.15.8: bump expat version to 2.6.0

[Crucio32000]

This fixes Qt compilation (version 5.15.12) when using with_dbus option to True.

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[github-actions]

🤖 Beep Boop! This pull request is making changes to 'recipes/dbus//'.

👋 @jwillikers you might be interested. 😉

[ericLemanissierBot]

I detected other pull requests that are modifying dbus/1.x.x recipe:

• dbus: don't propagate X11 libs, drop with_glib, update license info #23384
• dbus: Add dbus_user option to allow specifying a different run user #22158
• dbus: with_x11=True does not mean libdbus depends on xorg/system #22134
• Update conanfile.py #22094

This message is automatically generated by https://github.com/ericLemanissier/conan-center-conflicting-prs so don't hesitate to report issues/improvements there.

[valgur]

Suggested change

	self.requires("expat/2.6.0")
	self.requires("expat/2.6.2")

?

[conan-center-bot]

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