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1406f9f8 - winVersion: recognize build 26300 as Windows 11 Version 26H2 (2026 update) (#20648)

winVersion: recognize build 26300 as Windows 11 Version 26H2 (2026 update) (#20648) Closes #20559 Summary of the issue: On June 19, 2026, Microsoft announced Windows 11 Version 26H2 with the build number of 26300. Description of user facing changes: None Description of developer facing changes: source/winVersion.py: Updated copyright header Added constants for Windows 11 26H2 including build to release names mapping Description of development approach: Added winVersion.WIN11_26H2 as the constant representing Windows 11 Version 26H2. Testing (see below) requires computers running builds below, on, and above 26300. The computer used to develop this PR runs build 26300 (Insider Preview).