66524 [Icons] Update icon version to point to file that iOS will prefer. (cla: yes, f: material design, platform-ios, t: xcode, waiting for tree to go green)

66542 Fix last month not being displayed if last date is selected in DateRangePicker (cla: yes, f: material design, framework, waiting for tree to go green)

66596 [Material] Remove opacity from dark theme overlay check (cla: yes, f: material design, framework, waiting for tree to go green)

66597 Replaced obsolete use of FlatButton with TextButton (cla: yes, f: material design, framework, waiting for tree to go green)

66633 migration of material files to nullsafety (cla: yes, f: material design, framework, waiting for tree to go green)

66640 Add decoration parameter to DataTable and DataTableTheme (cla: yes, f: material design, framework)