Update dependency pip-tools to v6.13.0

This MR contains the following updates:

Package	Update	Change
pip-tools (changelog)	minor	==6.12.3 -> ==6.13.0

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Release Notes

jazzband/pip-tools

v6.13.0

Compare Source

Features:

• Add support for self-referential extras (#​1791). Thanks @​q0w
• Add support for pip==23.1 where removed FormatControl in WheelCache (#​1834). Thanks @​atugushev
• Add support for pip==23.1 where refactored requirement options (#​1832). Thanks @​atugushev
• Add support for pip==23.1 where deprecated --install-option has been removed (#​1828). Thanks @​atugushev

Bug Fixes:

• Pass --cache-dir to --pip-args for backtracking resolver (#​1827). Thanks @​q0w

Other Changes:

• Update examples in README (#​1835). Thanks @​lucaswerkmeister

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