Update dependency pip-tools to v7.3.0

This MR contains the following updates:

Package	Update	Change
pip-tools (changelog)	minor	==7.2.0 -> ==7.3.0

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Release Notes

jazzband/pip-tools (pip-tools)

v7.3.0

Compare Source

09 Aug 2023

Features:

• Add --no-strip-extras and warn about strip extras by default (#​1954). Thanks @​ryanhiebert

Bug Fixes:

• Fix revealed default config in header if requirements in subfolder (#​1904). Thanks @​atugushev
• Direct references show extra requirements in .txt files (#​1582). Thanks @​FlorentJeannot

Other Changes:

• Document how to run under pipx run (#​1951). Thanks @​brettcannon
• Document that the backtracking resolver is the current default (#​1948). Thanks @​jeffwidman

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