Deprecated: Using ${var} in strings is deprecated, use {$var} instead

Problem/Motivation

Remove the Deprecated warnings.

Deprecated: Using ${var} in strings is deprecated, use {$var} instead in /var/www/web/modules/contrib/opigno_calendar/src/Plugin/Field/FieldWidget/OpignoDateRangeWidget.php on line 146

Deprecated: Using ${var} in strings is deprecated, use {$var} instead in /var/www/web/modules/contrib/opigno_calendar/src/Plugin/Field/FieldWidget/OpignoDateRangeWidget.php on line 153

Steps to reproduce

Proposed resolution

Update code to remove the warning.

Remaining tasks

None

User interface changes

None

API changes

None

Data model changes

None