Bump version to 2.6.0

[avanelsas]

Summary

• Bump version to 2.6.0 in package.json, build.clj, deps.edn, docs/installation.md
• Add changelog entry

What's in 2.6.0

Added:

• Cancelable change-request events for 7 input components (Add cancelable change-request events to input components #39)

Fixed:

• x-context-menu Escape/click-outside dismiss (Fix misc bugs: context menu dismiss, carousel demo, test hint, combobox category #42)
• x-button mobile Safari press events (Fix misc bugs: context menu dismiss, carousel demo, test hint, combobox category #42)
• x-carousel demo control panel (Fix misc bugs: context menu dismiss, carousel demo, test hint, combobox category #42)
• x-welcome-tour test type hint (Fix misc bugs: context menu dismiss, carousel demo, test hint, combobox category #42)
• x-combobox demo gallery category (Fix misc bugs: context menu dismiss, carousel demo, test hint, combobox category #42)

Release steps after merge

git checkout main && git pull
git tag v2.6.0 && git push origin main --tags

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