chore(dev): release 2.26.3

[github-actions[bot]]

:robot: I have created a release beep boop

2.26.3 (2024-04-25)

Bug Fixes

• filter lang map (#1209) (1d20241)
• update variable INPUT_BRANCH to BRANCH to avoid Github runner emptying the value (#1208) (c2365c9)

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[github-actions[bot]]

:robot: Release is at https://github.com/pressbooks/pressbooks-book/releases/tag/2.26.3 :sunflower: