Bump rubocop from 1.56.4 to 1.61.0

This version fixes false negatives for Lint/SymbolConversion when using
string interpolation, for Style/RedundantArgument when using the safe
navigation operator, for Style/RedundantParentheses when logical
operators are involved and for Style/RedundantReturn with lambda ending
with return. We're applying the new rules.

Bumps [rubocop](https://github.com/rubocop/rubocop) from 1.56.4 to 1.61.0.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop/compare/v1.56.4...v1.61.0)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

app/controllers/admin/poll/shifts_controller.rb

@@ -57,7 +57,7 @@ class Admin::Poll::ShiftsController < Admin::Poll::BaseController
 
     def shift_params
       shift_params = params.require(:shift).permit(allowed_params)
-      shift_params.merge(date: shift_params[:date]["#{shift_params[:task]}_date".to_sym])
+      shift_params.merge(date: shift_params[:date][:"#{shift_params[:task]}_date"])
     end
 
     def allowed_params