chore: update WebKit version to 26.0

[dgozman]

https://developer.apple.com/documentation/safari-release-notes/safari-26-release-notes

[github-actions]

Test results for "tests 1"

6 flaky

⚠️ [chromium-library] › library/inspector/pause.spec.ts:74:5 › pause › should pause and resume the script with keyboard shortcut @chromium-ubuntu-22.04-node18
⚠️ [firefox-library] › library/inspector/cli-codegen-1.spec.ts:1079:7 › cli codegen › should not throw csp directive violation errors @firefox-ubuntu-22.04-node18
⚠️ [firefox-page] › page/page-emulate-media.spec.ts:144:3 › should keep reduced motion and color emulation after reload @firefox-ubuntu-22.04-node18
⚠️ [firefox-page] › page/page-goto.spec.ts:81:3 › should work with Cross-Origin-Opener-Policy @firefox-ubuntu-22.04-node18
⚠️ [playwright-test] › ui-mode-test-output.spec.ts:80:5 › should show console messages for test @macos-latest-node18-1
⚠️ [webkit-library] › library/inspector/pause.spec.ts:74:5 › pause › should pause and resume the script with keyboard shortcut @webkit-ubuntu-22.04-node18

46710 passed, 928 skipped
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Merge workflow run.