Update pdf.js to v4.0.269

.vscodeignore

dev/editviewer.py

dev/viewer/viewer.html.diff

dev/viewer/viewer.mjs.diff

package-lock.json

package.json

viewer/components/utils.ts

viewer/images/editor-toolbar-delete.svg

viewer/images/loading-dark.svg

viewer/latexworkshop.css

viewer/latexworkshop.ts

viewer/locale/be/viewer.ftl

viewer/locale/cy/viewer.ftl

viewer/locale/da/viewer.ftl

viewer/locale/dsb/viewer.ftl

viewer/locale/el/viewer.ftl

viewer/locale/en-GB/viewer.ftl

viewer/locale/en-US/viewer.ftl

viewer/locale/eo/viewer.ftl

viewer/locale/es-CL/viewer.ftl