Update Aqua requirement from 0.6 to 0.6, 0.8

[dependabot]

Updates the requirements on Aqua to permit the latest version.

Release notes

Sourced from Aqua's releases.

v0.8.18

Fixed

• test_persistent_tasks no longer errors on a weak dependency that is also listed in [deps] but not installed. (#400)

The changes are documented in the CHANGELOG.md file.

Diff since v0.8.17

Changelog

Sourced from Aqua's changelog.

Version [v0.8.18] - 2026-09-18

Fixed

• test_persistent_tasks no longer errors on a weak dependency that is also listed in [deps] but not installed. (#400)

Version [v0.8.17] - 2026-09-17

Changed

• test_persistent_tasks now reports a precompilation failure as a precompilation error instead of misclassifying it as a persistent task. The default tmax is also raised to 30 seconds (still configurable) to reduce false positives when a package without persistent tasks is merely slow to shut down. (#389)
• test_persistent_tasks now uses the environment package is loaded from, so deved and path-tracked dependencies are supported. (#394)

Version [v0.8.16] - 2026-06-05

Changed

• Adapt to deprecations in julia 1.14. (#381)
• Fix some world age issues in test_ambiguities. (#366)

Version [v0.8.15] - 2026-06-02

Changed

• Use Base.isType for Type{...} checks in piracy detection so it keeps working when Type{Foo} is no longer a DataType on future Julia versions. (#379)

Version [v0.8.14] - 2025-08-04

Changed

• Adapt to internal method table changes in Julia 1.12 and later. (#344)

Version [v0.8.13] - 2025-05-28

Changed

• Adapt to internal method table changes in Julia 1.12 and later. (#334)

Version [v0.8.12] - 2025-05-05

Changed

• Add test_undocumented_names to verify that all public symbols have docstrings (not including the module itself). This test is not enabled by default in test_all. (#313)

... (truncated)

Commits

• fe0dc2c [release-0.8] Bump version to v0.8.18 (#402)
• b0a9125 Fix for old julias
• da7b66f Skip uninstalled weak deps in test_persistent_tasks (#400)
• 0aa5127 Fix typo in changelog
• 97a1148 [release-0.8] Bump version to v0.8.17 (#397)
• 7c9c7b8 [release-0.8] Backports for v0.8.17 (#396)
• 37326ae Update changelog
• 5c0da47 Bump version to v0.8.16
• 429466e Fix for old julias
• 7370f3f Adapt to various deprecations around Type{T} in julia nightly (#381)
• Additional commits viewable in compare view

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