Upgrade beefsack/go-rate (#735)

Fixes #725

### Motivation

This PR will enable pulsar-client-go to be a compliant library. One of its dependencies was not compliant with OSS licensing requirements earlier, and this PR upgrades to the latest version of it, which has a MIT license.

### Modifications

Ran the following commands
```bash
go get github.com/beefsack/go-rate@latest
go mod tidy
```

### Verifying this change

- [x] Make sure that the change passes the CI checks.
diff --git a/go.mod b/go.mod
index c788991..e57ac12 100644
--- a/go.mod
+++ b/go.mod
@@ -6,7 +6,7 @@
 	github.com/AthenZ/athenz v1.10.39
 	github.com/DataDog/zstd v1.5.0
 	github.com/apache/pulsar-client-go/oauth2 v0.0.0-20220120090717-25e59572242e
-	github.com/beefsack/go-rate v0.0.0-20180408011153-efa7637bb9b6
+	github.com/beefsack/go-rate v0.0.0-20220214233405-116f4ca011a0
 	github.com/bmizerany/perks v0.0.0-20141205001514-d9a9656a3a4b
 	github.com/davecgh/go-spew v1.1.1
 	github.com/gogo/protobuf v1.3.2
diff --git a/go.sum b/go.sum
index 0e0fe1c..28bc3be 100644
--- a/go.sum
+++ b/go.sum
@@ -60,8 +60,8 @@
 github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
 github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
 github.com/aws/aws-sdk-go v1.32.6/go.mod h1:5zCpMtNQVjRREroY7sYe8lOMRSxkhG6MZveU8YkpAk0=
-github.com/beefsack/go-rate v0.0.0-20180408011153-efa7637bb9b6 h1:KXlsf+qt/X5ttPGEjR0tPH1xaWWoKBEg9Q1THAj2h3I=
-github.com/beefsack/go-rate v0.0.0-20180408011153-efa7637bb9b6/go.mod h1:6YNgTHLutezwnBvyneBbwvB8C82y3dcoOj5EQJIdGXA=
+github.com/beefsack/go-rate v0.0.0-20220214233405-116f4ca011a0 h1:0b2vaepXIfMsG++IsjHiI2p4bxALD1Y2nQKGMR5zDQM=
+github.com/beefsack/go-rate v0.0.0-20220214233405-116f4ca011a0/go.mod h1:6YNgTHLutezwnBvyneBbwvB8C82y3dcoOj5EQJIdGXA=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=