app: v2.3.1

What's Changed

• Bump app version to v2.3.1 by @nilsreichardt in #1934
• Add pdfjs to console/index.html to fix the console by @nilsreichardt in #1935
• Add feedback filters "all feedbacks", "unread comments", "no comments yet" to console by @nilsreichardt in #1936
• Rename admin permission methods for clarity in CourseDetailsBloc and update references in CourseMemberOptions. by @Jonas-Sander in #1940
• Upgrade to Flutter v3.35 by @nilsreichardt in #1920
• Bump file_picker from 9.0.0 to 10.3.3 by @dependabot[bot] in #1948
• Fix choosing name bug in onboarding by @nilsreichardt in #1950
• Upgrade Codemagic CLI Tools by @nilsreichardt in #1958
• Update compileSdkVersion and targetSdkVersion to use Flutter variables by @nilsreichardt in #1953

Full Changelog: app-v2.3.0...app-v2.3.1