fix(deps): update module github.com/stretchr/testify to v1.8.4 (#678)

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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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core/go.mod

@@ -17,7 +17,7 @@ require (
 	github.com/robfig/cron v1.2.0
 	github.com/rs/cors v1.9.0
 	github.com/rs/xid v1.5.0
-	github.com/stretchr/testify v1.8.3
+	github.com/stretchr/testify v1.8.4
 	github.com/xeipuuv/gojsonschema v1.2.0
 	github.com/zeebo/xxh3 v1.0.2
 	go.opentelemetry.io/otel v1.16.0

core/go.sum

@@ -697,6 +697,8 @@ 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/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f/go.mod h1:N2zxlSyiKSe5eX1tZViRH5QA0qijqEDrYZiPEAiq3wU=
 github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb h1:zGWFAtiMcyryUHoUjUJX0/lt1H2+i2Ka2n+D3DImSNo=
 github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb/go.mod h1:N2zxlSyiKSe5eX1tZViRH5QA0qijqEDrYZiPEAiq3wU=