fix(deps): update module github.com/stretchr/testify to v1.8.4 (#97)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [github.com/stretchr/testify](https://togithub.com/stretchr/testify) |
require | patch | `v1.8.3` -> `v1.8.4` |

---

### Release Notes

<details>
<summary>stretchr/testify</summary>

###
[`v1.8.4`](https://togithub.com/stretchr/testify/compare/v1.8.3...v1.8.4)

[Compare
Source](https://togithub.com/stretchr/testify/compare/v1.8.3...v1.8.4)

</details>

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go.mod

@@ -5,7 +5,7 @@ go 1.17
 require (
 	github.com/magefile/mage v1.15.0
 	github.com/spf13/cobra v1.7.0
-	github.com/stretchr/testify v1.8.3
+	github.com/stretchr/testify v1.8.4
 	golang.org/x/lint v0.0.0-20210508222113-6edffad5e616
 )
 

go.sum

@@ -30,6 +30,8 @@ github.com/stretchr/testify v1.8.2 h1:+h33VjcLVPDHtOdpUCuF+7gSuG3yGIftsP1YvFihtJ
 github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/stretchr/testify v1.8.3 h1:RP3t2pwF7cMEbC1dqtB6poj3niw/9gnV4Cjg5oW5gtY=
 github.com/stretchr/testify v1.8.3/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=