docs: correct stale dependency and version references

[wbarnha]

Description

Fixes stale references in the user-facing docs surfaced while auditing the
GitHub Pages docs for the 0.12 line. All changes are documentation-only.

Correctness fixes

• redis extra listed the deprecated aredis. The extra is backed by
  redis-py now (since Replace aredis with redis-py #635), so the Extensions table said the wrong library.
• Python-version contradiction in "What do I need?". The sidebar claimed
  Python 3.8 or later while the prose immediately below already states the
  real minimum, Python 3.10 or later. Aligned the sidebar to 3.10.
• Dropped two stale "Faust version 1.0" self-references (the requirements
  sidebar subtitle and the storage-driver section in the App user guide).

Completeness / freshness

• Documented previously-undocumented install bundles: faust[ckafka]
  (confluent-kafka / confluent:// transport), faust[rocksdict] (RocksDB via
  the rocksdict bindings), and faust[prometheus] / faust[sentry] sensors.
• Refreshed the docs copyright to 2026 and noted the faust-streaming
  project's continued maintenance (conf.py + copyright.rst).

The grid-table column widths are preserved (verified against the +---+
separators), and docs/conf.py byte-compiles.

Scope notes

• Every documented bundle was checked against setup.py's BUNDLES and
  requirements/extras/. aerospike is intentionally omitted — it ships a
  requirements file but is not in BUNDLES, so faust[aerospike] is not an
  installable extra.
• The frozen history/ changelogs and the auto-generated reference/ API docs
  were intentionally left untouched — they document past releases.
• opentracing / opentelemetry extras are not documented here because
  those extras don't exist on master yet (their PRs Remove dead opentracing reference from the confluent driver #685/Make opentracing an optional dependency (faust[opentracing]) #686/Add optional faust[opentelemetry] extra + docs for OpenTelemetry via the OpenTracing shim #688 are still
  open); documenting them now would be inaccurate. They can be added when those
  land.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.15%. Comparing base (d95af52) to head (989ad6c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #710   +/-   ##
=======================================
  Coverage   94.15%   94.15%           
=======================================
  Files         104      104           
  Lines       11136    11136           
  Branches     1201     1201           
=======================================
  Hits        10485    10485           
  Misses        550      550           
  Partials      101      101           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.