Bump github.com/go-openapi/strfmt from 0.21.2 to 0.21.8

[dependabot[bot]]

Bumps github.com/go-openapi/strfmt from 0.21.2 to 0.21.8.

Commits

• 447abe8 Merge pull request #107 from carlv-stripe/master
• f514ed1 Update time_test.go
• 2f7945a Update time.go
• a4262bd Update format_test.go
• 7b5538a run go mod tidy
• 608cbc9 clear linting warning
• b36a490 use pointer receivers on the IsZero variants for DateTime
• a70f44a Merge pull request #102 from Kunde21/parse_location
• a1049a1 update golangci lint info
• d40cbfc Merge pull request #105 from bg451/add_date_time_is_zero
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #120.