fix(deps): update module github.com/urfave/cli/v2 to v2.25.7 (#91)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [github.com/urfave/cli/v2](https://github.com/urfave/cli) | require | minor | `v2.16.3` -> `v2.25.7` |

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Reviewed-on: https://codeberg.org/woodpecker-plugins/docker-buildx/pulls/91
Co-authored-by: Patrick Schratz <pat-s@mailbox.org>
Co-committed-by: Patrick Schratz <pat-s@mailbox.org>

go.mod

@@ -9,13 +9,13 @@ require (
 	github.com/joho/godotenv v1.4.0
 	github.com/sirupsen/logrus v1.9.0
 	github.com/stretchr/testify v1.8.0
-	github.com/urfave/cli/v2 v2.16.3
+	github.com/urfave/cli/v2 v2.25.7
 	golang.org/x/lint v0.0.0-20210508222113-6edffad5e616
 	honnef.co/go/tools v0.3.3
 )
 
 require (
-	github.com/BurntSushi/toml v1.1.0 // indirect
+	github.com/BurntSushi/toml v1.3.2 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect