Update rich text editor library to support pasting of images

[langleyd]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

matrix-org/matrix-rich-text-editor#700 fixes an issue of non-text based paste actions being swallowed by the rte EditText.

Motivation and context

Fixes #8270

Screenshots / GIFs

Tests

• Tests were added in the rte repo for pasting of text, html and images.
• Manual tests were done that pasting of text, html and images work on on element android.

Tested devices

• Physical
• [ x Emulator
• OS version(s):

Checklist

• Changes has been tested on an Android device or Android emulator with API 21
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com./vector-im/element-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request includes a new file under ./changelog.d. See https://github.com./vector-im/element-android/blob/develop/CONTRIBUTING.md#changelog
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off
• You've made a self review of your PR
• If you have modified the screen flow, or added new screens to the application, you have updated the test UiAllScreensSanityTest.allScreensTest()

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