update dependencies (tink) (#48)

Signed-off-by: Kelly Deng <[email protected]>

## Description

<!--- Please describe what this PR is going to change -->
Following the merge of tinkerbell/tink#345, the `github/tinkerbell/tink` dependency in `go.mod` needs to be updated to point to the latest master.

## Why is this needed

<!--- Link to issue you have raised -->
The PR tinkerbell/tink#345 updated the protobuf files and as a result, hegel (still importing an older version of tink) can no longer properly communicate with the latest version of tink.

Fixes: #

## How Has This Been Tested?
<!--- Please describe in detail how you tested your changes. -->
<!--- Include details of your testing environment, and the tests you ran to -->
<!--- see how your change affects other areas of the code, etc. -->

* Tests pass
* Tested manually

## How are existing users impacted? What migration steps/scripts do we need?

<!--- Fixes a bug, unblocks installation, removes a component of the stack etc -->
<!--- Requires a DB migration script, etc. -->


## Checklist:

I have:

- [ ] updated the documentation and/or roadmap (if required)
- [ ] added unit or e2e tests
- [ ] provided instructions on how to upgrade

go.mod

@@ -12,6 +12,15 @@ require (
 	github.com/packethost/xff v0.0.0-20190305172552-d3e9190c41b3
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.6.0
-	github.com/tinkerbell/tink v0.0.0-20200807143153-f5831e4a5fb8
-	google.golang.org/grpc v1.29.1
+	github.com/tinkerbell/tink v0.0.0-20201109122352-0e8e57332303
+	go.uber.org/multierr v1.6.0 // indirect
+	go.uber.org/zap v1.16.0 // indirect
+	golang.org/x/lint v0.0.0-20200302205851-738671d3881b // indirect
+	golang.org/x/net v0.0.0-20200904194848-62affa334b73 // indirect
+	golang.org/x/sys v0.0.0-20200826173525-f9321e4c35a6 // indirect
+	golang.org/x/text v0.3.3 // indirect
+	golang.org/x/tools v0.0.0-20200921190806-0f52b63a40e8 // indirect
+	google.golang.org/genproto v0.0.0-20200921165018-b9da36f5f452 // indirect
+	google.golang.org/grpc v1.32.0
+	gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 // indirect
 )