Merge pull request #4032 from nextcloud/dependabot/npm_and_yarn/ckeditor/ckeditor5-dev-webpack-plugin-23.6.1

Bumps [@ckeditor/ckeditor5-dev-webpack-plugin](https://github.com/ckeditor/ckeditor5-dev/tree/HEAD/packages/ckeditor5-dev-webpack-plugin) from 23.6.0 to 23.6.1.
- [Release notes](https://github.com/ckeditor/ckeditor5-dev/releases)
- [Changelog](https://github.com/ckeditor/ckeditor5-dev/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ckeditor/ckeditor5-dev/commits/v23.6.1/packages/ckeditor5-dev-webpack-plugin

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [sebastian/object-enumerator](https://github.com/sebastianbergmann/object-enumerator) from 4.0.3 to 4.0.4.
- [Release notes](https://github.com/sebastianbergmann/object-enumerator/releases)
- [Changelog](https://github.com/sebastianbergmann/object-enumerator/blob/master/ChangeLog.md)
- [Commits](https://github.com/sebastianbergmann/object-enumerator/compare/4.0.3...4.0.4

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [amphp/amp](https://github.com/amphp/amp) from 2.5.0 to 2.5.1.
- [Release notes](https://github.com/amphp/amp/releases)
- [Changelog](https://github.com/amphp/amp/blob/master/CHANGELOG.md)
- [Commits](https://github.com/amphp/amp/compare/v2.5.0...v2.5.1

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 5.0.0 to 5.0.1.
- [Release notes](https://github.com/webpack-contrib/css-loader/releases)
- [Changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/css-loader/compare/v5.0.0...v5.0.1

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [node-sass](https://github.com/sass/node-sass) from 4.14.1 to 5.0.0.
- [Release notes](https://github.com/sass/node-sass/releases)
- [Changelog](https://github.com/sass/node-sass/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sass/node-sass/compare/v4.14.1...v5.0.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [js-base64](https://github.com/dankogai/js-base64) from 3.5.2 to 3.6.0.
- [Release notes](https://github.com/dankogai/js-base64/releases)
- [Commits](https://github.com/dankogai/js-base64/compare/3.5.2...3.6.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [phpunit/php-text-template](https://github.com/sebastianbergmann/php-text-template) from 2.0.3 to 2.0.4.
- [Release notes](https://github.com/sebastianbergmann/php-text-template/releases)
- [Changelog](https://github.com/sebastianbergmann/php-text-template/blob/master/ChangeLog.md)
- [Commits](https://github.com/sebastianbergmann/php-text-template/compare/2.0.3...2.0.4

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Clean up HTML response

Fix envelope timestamp overlap

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Drop php7.2 from CI and info.xml

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Responsive mail iframe

Signed-off-by: Richard Steinmetz <richard@steinmetz.cloud>

The code assume that timestamps would be unique. Of course that is not
always the case.

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Bump CKEditor to v23.1

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Improve html message rendering

Signed-off-by: Richard Steinmetz <richard@steinmetz.cloud>

Handle null email address before iconv conversion

Allow composing new messages based on existing ones

Document how admins can collect troubleshoot information

Link to user and dev docs as well on the app store

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Update changelog for v1.5.2