Prepare v26.10

[tefra]

Bump version to 26.10 and add the changelog to CHANGES.md and README.md.

Security

• Disable external entity resolution in LxmlEventHandler by default
  (#1228)

Fixes

• Fix wrapper binding when collection item element name is reused
  (#1224)
• Fix KeyError in is_binding_model when models_package is not set
  (#1219)
• Validate calendar date in XmlDate.from_string
  (#1227)
• Add charset to the SOAP client content-type header
  (#1231)
• Skip xsi:nil for a present instance of a type without content
  (#1234)
• Skip None text when binding wildcard list elements
  (#1237)

Features

• Share compiled jinja templates across generators
  (#1235)
• Add third-party license notices for bundled schemas and graphs util
  (#1238)

🤖 Generated with Claude Code

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.97%. Comparing base (8df95bc) to head (c7623b2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1239   +/-   ##
=======================================
  Coverage   99.97%   99.97%           
=======================================
  Files         117      117           
  Lines        9414     9414           
  Branches     1447     1447           
=======================================
  Hits         9412     9412           
  Misses          1        1           
  Partials        1        1           

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