no function clause matching in Keyword.delete_key/3

[boolafish]

Describe the bug

Elixir.FunctionClauseError: no function clause matching in Keyword.delete_key/3
  File "lib/tzdata/util.ex", line 73, in Tzdata.Util.first_matching_weekday_in_month/4
  File "lib/tzdata/util.ex", line 293, in Tzdata.Util.time_for_rule/2
  File "lib/tzdata/period_builder.ex", line 158, in Tzdata.PeriodBuilder.calc_periods_for_year/9
  File "lib/tzdata/period_builder.ex", line 177, in Tzdata.PeriodBuilder.calc_periods_for_year/9
  File "lib/tzdata/period_builder.ex", line 182, in Tzdata.PeriodBuilder.calc_periods_for_year/9
  File "lib/tzdata/period_builder.ex", line 177, in Tzdata.PeriodBuilder.calc_periods_for_year/9
  File "lib/tzdata/period_builder.ex", line 182, in Tzdata.PeriodBuilder.calc_periods_for_year/9
  File "lib/tzdata/period_builder.ex", line 177, in Tzdata.PeriodBuilder.calc_periods_for_year/9
  Module "Elixir.Tzdata.ReleaseUpdater", in Tzdata.ReleaseUpdater.init/1

Additional context
From sentry: https://sentry.io/organizations/omisego/issues/1095854556/?query=is%3Aunresolved&statsPeriod=14d