Update tox requirement from <3.25,>=3.20 to >=3.20,<4.4

[dependabot]

Updates the requirements on tox to permit the latest version.

Release notes

Sourced from tox's releases.

4.3.2

What's Changed

• Fix rendering of version_added by @​kurtmckee in tox-dev/tox#2867
• Fix a RestructuredText typo by @​kurtmckee in tox-dev/tox#2866
• Fix typos in {tox_root} variable name by @​kurtmckee in tox-dev/tox#2871
• Fix regression with multiple env substitutions for the same key by @​masenf in tox-dev/tox#2873
• Fix a incorrect config key name by @​kurtmckee in tox-dev/tox#2868

New Contributors

• @​kurtmckee made their first contribution in tox-dev/tox#2867

Full Changelog: tox-dev/tox@4.3.1...4.3.2

Changelog

Sourced from tox's changelog.

v4.3.2 (2023-01-16)

Bugfixes - 4.3.2

- Fix regression introduced in 4.3.0 which occured when a substitution expression
  for an environment variable that had previously been substituted appears in the
  ini file after a substitution expression for a different environment variable.
  This situation erroneously resulted in an exception about "circular chain
  between set" of those variables - by :user:`masenf`. (:issue:`2869`)
v4.3.1 (2023-01-15)
Bugfixes - 4.3.1

• Fix regression introduced in 4.3.0 by expanding substitution expressions ({...}) that result from a previous subsitution's replacement value (up to 100 times). Note that recursive expansion is strictly depth-first; no replacement value will ever affect adjacent characters nor will expansion ever occur over the result of more than one replacement - by :user:masenf. (:issue:2863)

v4.3.0 (2023-01-15)

Features - 4.3.0

- Rewrite substitution replacement parser - by :user:`masenf`

\ acts as a proper escape for \ in ini-style substitutions
The resulting value of a substitution is no longer reprocessed in the context
of the broader string. (Prior to this change, ini-values were repeatedly re-substituted until
the expression no longer had modifications)
Migrate and update "Substitutions" section of Configuration page from v3 docs.
find_replace_part is removed from tox.config.loader.ini.replace
New names exported from tox.config.loader.ini.replace:

find_replace_expr
MatchArg
MatchError
MatchExpression
Note: the API for replace itself is unchanged. (:issue:2732)




Improved documentation for factors and test env names - by :user:stephenfin. (:issue:2852)

v4.2.8 (2023-01-11)
Bugfixes - 4.2.8
</tr></table>

... (truncated)

Commits

• a2222e9 release 4.3.2
• 14194d6 Fix a incorrect config key name (#2868)
• 0006a12 Fix regression with multiple env substitutions for the same key (#2873)
• 2d46a1e Fix typos in {tox_root} variable name
• d17994f Fix a RestructuredText typo
• aeaba41 Fix rendering of version_added
• 7ccd0f1 release 4.3.1
• 99b849b Recursive replace (#2864)
• 6fe280a release 4.3.0
• aff1d4d Rewrite substitution parser (#2861)
• Additional commits viewable in compare view

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[dependabot]

Superseded by #272.