Update module github.com/prometheus/client_golang to v1.20.2 (#827)

| datasource | package                             | from    | to      |
| ---------- | ----------------------------------- | ------- | ------- |
| go         | github.com/prometheus/client_golang | v1.20.1 | v1.20.2 |

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/alecthomas/kingpin/v2 v2.4.0
 	github.com/go-kit/log v0.2.1
 	github.com/nginxinc/nginx-plus-go-client v1.3.0
-	github.com/prometheus/client_golang v1.20.1
+	github.com/prometheus/client_golang v1.20.2
 	github.com/prometheus/common v0.58.0
 	github.com/prometheus/exporter-toolkit v0.12.0
 )

go.sum

@@ -40,8 +40,8 @@ github.com/nginxinc/nginx-plus-go-client v1.3.0 h1:q/aeT4B5k0KLwWlefoBzfLfraBBvI
 github.com/nginxinc/nginx-plus-go-client v1.3.0/go.mod h1:n8OFLzrJulJ2fur28Cwa1Qp5DZNS2VicLV+Adt30LQ4=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/prometheus/client_golang v1.20.1 h1:IMJXHOD6eARkQpxo8KkhgEVFlBNm+nkrFUyGlIu7Na8=
-github.com/prometheus/client_golang v1.20.1/go.mod h1:PIEt8X02hGcP8JWbeHyeZ53Y/jReSnHgO035n//V5WE=
+github.com/prometheus/client_golang v1.20.2 h1:5ctymQzZlyOON1666svgwn3s6IKWgfbjsejTMiXIyjg=
+github.com/prometheus/client_golang v1.20.2/go.mod h1:PIEt8X02hGcP8JWbeHyeZ53Y/jReSnHgO035n//V5WE=
 github.com/prometheus/client_model v0.6.1 h1:ZKSh/rekM+n3CeS952MLRAdFwIKqeY8b62p8ais2e9E=
 github.com/prometheus/client_model v0.6.1/go.mod h1:OrxVMOVHjw3lKMa8+x6HeMGkHMQyHDk9E3jmP2AmGiY=
 github.com/prometheus/common v0.58.0 h1:N+N8vY4/23r6iYfD3UQZUoJPnUYAo7v6LG5XZxjZTXo=