[BUMP] Update dependency privatebin/privatebin to v1.7.4 (bin)

[renovate]

This PR contains the following updates:

Package	Update	Change
privatebin/privatebin	patch	1.7.3 -> 1.7.4

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Release Notes

privatebin/privatebin (privatebin/privatebin)

v1.7.4

Compare Source

• CHANGED: Saving markdown pastes uses .md extension instead of .txt (#​1293)
• CHANGED: Enable strict type checking in PHP (#​1350)
• CHANGED: Various tweaks of the bootstrap5 template, suggested by the community
• FIXED: Reset password input field on creation of new paste (#​1194)
• FIXED: Allow database schema upgrade to skip versions (#​1343)
• FIXED: bootstrap5 dark mode toggle unset on dark browser preference (#​1340)
• FIXED: Prevent bypassing YOURLS proxy URL filter, allowing to shorten non-self URLs

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