REGINA—Saskatchewan is tightening public-health measures in and around its capital city over concerns about the spread of COVID-19 variants. The province says a ban on household guests that was lifted two weeks ago is immediately back in place in Regina and surrounding communities. Starting Sunday, restaurants and bars will not be allowed to serve customers and will have to switch to takeout or delivery. Community halls, museums, libraries and “any non-essential indoor locations” won’t be able to operate. The province is not recommending travel in or out of the Regina area unless absolutely necessary. And it is advising anyone who can work from home to do so. Premier Scott Moe said the province is in a “very challenging” moment in the pandemic as vaccinations continue but variant cases increase. He says while infections are dropping elsewhere in the province, they’re rising in Regina and it’s “very likely” public health measures …