chore(deps): update virtualenv requirement from >=21.7.8 to >=21.7.9

[dependabot]

Updates the requirements on virtualenv to permit the latest version.

Release notes

Sourced from virtualenv's releases.

21.7.9

What's Changed

• fix(test): EncodingWarning: 'encoding' argument not specified by @​even-even in pypa/virtualenv#3228
• 🐛 fix(config): ignore a config file that fails to parse instead of crashing by @​darrenhuai in pypa/virtualenv#3230
• 🐛 fix(util): replace a stale symlink instead of writing through it by @​darrenhuai in pypa/virtualenv#3229

Full Changelog: pypa/virtualenv@21.7.8...21.7.9

Changelog

Sourced from virtualenv's changelog.

Bugfixes - 21.7.9

• Replace dangling symlinks, including interpreter aliases, when recreating an environment. This prevents FileExistsError with --symlinks and writes outside the environment with --copies - by :user:darrenhuai. (:issue:3229)
• Ignore malformed or unreadable virtualenv.ini files and report the error in the log and --help. Accept a UTF-8 byte order mark, as written by PowerShell 5 and older Notepad versions - by :user:darrenhuai. (:issue:3230)

---

v21.7.8 (2026-09-01)

---

Bugfixes - 21.7.8

• A missing source needed by both install modes now disables the builtin creator through meta.error. The check compared RefWhen values against RefMust members, so creation went on to fail with a FileNotFoundError or a dangling symlink - by :user:darrenhuai. (:issue:3227)

---

v21.7.7 (2026-08-28)

---

Bugfixes - 21.7.7

• Bump the python-discovery minimum to >=1.6 for PythonInfo.system_exe, which reports the system interpreter without the nullable typing of system_executable - by :user:gaborbernat. (:issue:3224)

Improved Documentation - 21.7.7

• Document the names the interpreter answers to inside a created environment. A new :doc:reference/environment-layout page lists them per platform, the tutorial and the usage guide point at it, and the explanation of creators covers why an environment carries several names and why Windows copies a redirector - by :user:gaborbernat. (:issue:3225)

---

v21.7.6 (2026-08-28)

---

Bugfixes - 21.7.6

• On Windows, virtualenv no longer copies the CPython 3.13+ venvlauncher.exe shim into Scripts under the shim's own name, and a host such as python_d.exe gets its alias back. The alias set took its names from the shim that stands in for the interpreter, so every environment gained a stray launcher copy and lost the interpreter's own file name - by :user:darrenhuai. (:issue:3223)

---

... (truncated)

Commits

• abd3829 release 21.7.9
• 66fadcb 🐛 fix(util): replace a stale symlink instead of writing through it (#3229)
• 4b31a63 🐛 fix(config): ignore a config file that fails to parse instead of crashing (...
• f9010b3 [pre-commit.ci] pre-commit autoupdate (#3231)
• 2ef85af fix(test): EncodingWarning: 'encoding' argument not specified (#3228)
• See full diff in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot show <dependency name> ignore conditions will show all of the ignore conditions of the specified dependency
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)

[dependabot]

Labels

The following labels could not be found: dependencies. Please create it before Dependabot can add it to a pull request.

Please fix the above issues or remove invalid values from dependabot.yml.