[BUMP] Update dependency privatebin/privatebin to v1.7.3 (bin)

[renovate]

This PR contains the following updates:

Package	Update	Change
privatebin/privatebin	patch	1.7.2 -> 1.7.3

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Release Notes

privatebin/privatebin (privatebin/privatebin)

v1.7.3

Compare Source

• CHANGED: Various tweaks of the bootstrap5 template, suggested by the community
• CHANGED: Upgrading libraries to: DOMpurify 3.1.3
• FIXED: Selected expiration not being applied, when using bootstrap template (#​1309)

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