build(deps): bump github.com/pierrec/lz4/v4 from 4.1.13 to 4.1.15 (#8397)

Bumps [github.com/pierrec/lz4/v4](https://github.com/pierrec/lz4) from 4.1.13 to 4.1.15.
- [Release notes](https://github.com/pierrec/lz4/releases)
- [Commits](https://github.com/pierrec/lz4/compare/v4.1.13...v4.1.15)

---
updated-dependencies:
- dependency-name: github.com/pierrec/lz4/v4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -36,7 +36,7 @@ require (
 	github.com/minio/sha256-simd v1.0.0
 	github.com/miscreant/miscreant.go v0.0.0-20200214223636-26d376326b75
 	github.com/oschwald/geoip2-golang v1.5.0
-	github.com/pierrec/lz4/v4 v4.1.13
+	github.com/pierrec/lz4/v4 v4.1.15
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.11.0
 	github.com/prometheus/common v0.30.0 // indirect