Bump github.com/prometheus/client_model from 0.2.0 to 0.3.0 (#2825)

Bumps [github.com/prometheus/client_model](https://github.com/prometheus/client_model) from 0.2.0 to 0.3.0.
- [Release notes](https://github.com/prometheus/client_model/releases)
- [Commits](prometheus/client_model@v0.2.0...v0.3.0)

---
updated-dependencies:
- dependency-name: github.com/prometheus/client_model
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

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

go.mod

@@ -17,7 +17,7 @@ require (
 	github.com/grpc-ecosystem/go-grpc-middleware v1.3.0
 	github.com/letsencrypt/pkcs11key/v4 v4.0.0
 	github.com/prometheus/client_golang v1.13.0
-	github.com/prometheus/client_model v0.2.0
+	github.com/prometheus/client_model v0.3.0
 	github.com/pseudomuto/protoc-gen-doc v1.5.1
 	github.com/transparency-dev/merkle v0.0.1
 	go.etcd.io/etcd/client/v3 v3.5.5

go.sum

@@ -637,8 +637,9 @@ github.com/prometheus/client_golang v1.13.0/go.mod h1:vTeo+zgvILHsnnj/39Ou/1fPN5
 github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
 github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
-github.com/prometheus/client_model v0.2.0 h1:uq5h0d+GuxiXLJLNABMgp2qUWDPiLvgCzz2dUR+/W/M=
 github.com/prometheus/client_model v0.2.0/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
+github.com/prometheus/client_model v0.3.0 h1:UBgGFHqYdG/TPFD1B1ogZywDqEkwp3fBMvqdiQ7Xew4=
+github.com/prometheus/client_model v0.3.0/go.mod h1:LDGWKZIo7rky3hgvBe+caln+Dr3dPggB5dvjtD7w9+w=
 github.com/prometheus/common v0.0.0-20181113130724-41aa239b4cce/go.mod h1:daVV7qP5qjZbuso7PdcryaAu0sAZbrN9i7WWcTMWvro=
 github.com/prometheus/common v0.4.0/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
 github.com/prometheus/common v0.4.1/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=