Bump contrib.go.opencensus.io/exporter/stackdriver

Bumps [contrib.go.opencensus.io/exporter/stackdriver](https://github.com/census-ecosystem/opencensus-go-exporter-stackdriver) from 0.13.10 to 0.13.12.
- [Release notes](https://github.com/census-ecosystem/opencensus-go-exporter-stackdriver/releases)
- [Commits](census-ecosystem/opencensus-go-exporter-stackdriver@v0.13.10...v0.13.12)

---
updated-dependencies:
- dependency-name: contrib.go.opencensus.io/exporter/stackdriver
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

go.mod

@@ -7,7 +7,7 @@ require (
 	cloud.google.com/go/monitoring v1.4.0
 	cloud.google.com/go/profiler v0.2.0
 	contrib.go.opencensus.io/exporter/prometheus v0.4.1
-	contrib.go.opencensus.io/exporter/stackdriver v0.13.10
+	contrib.go.opencensus.io/exporter/stackdriver v0.13.12
 	github.com/cenkalti/backoff v2.2.1+incompatible // indirect
 	github.com/dustin/go-humanize v1.0.0
 	github.com/go-bindata/go-bindata/v3 v3.1.3

go.sum

@@ -65,8 +65,8 @@ cloud.google.com/go/trace v1.0.0 h1:laKx2y7IWMjguCe5zZx6n7qLtREk4kyE69SXVC0VSN8=
 cloud.google.com/go/trace v1.0.0/go.mod h1:4iErSByzxkyHWzzlAj63/Gmjz0NH1ASqhJguHpGcr6A=
 contrib.go.opencensus.io/exporter/prometheus v0.4.1 h1:oObVeKo2NxpdF/fIfrPsNj6K0Prg0R0mHM+uANlYMiM=
 contrib.go.opencensus.io/exporter/prometheus v0.4.1/go.mod h1:t9wvfitlUjGXG2IXAZsuFq26mDGid/JwCEXp+gTG/9U=
-contrib.go.opencensus.io/exporter/stackdriver v0.13.10 h1:a9+GZPUe+ONKUwULjlEOucMMG0qfSCCenlji0Nhqbys=
-contrib.go.opencensus.io/exporter/stackdriver v0.13.10/go.mod h1:I5htMbyta491eUxufwwZPQdcKvvgzMB4O9ni41YnIM8=
+contrib.go.opencensus.io/exporter/stackdriver v0.13.12 h1:bjBKzIf7/TAkxd7L2utGaLM78bmUWlCval5K9UeElbY=
+contrib.go.opencensus.io/exporter/stackdriver v0.13.12/go.mod h1:mmxnWlrvrFdpiOHOhxBaVi1rkc0WOqhgfknj4Yg0SeQ=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
@@ -290,6 +290,8 @@ github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsT
 github.com/prometheus/procfs v0.1.3/go.mod h1:lV6e/gmhEcM9IjHGsFOCxxuZ+z1YqCvr4OA4YeYWdaU=
 github.com/prometheus/procfs v0.6.0 h1:mxy4L2jP6qMonqmq+aTtOx1ifVWUgG/TAmntgbh3xv4=
 github.com/prometheus/procfs v0.6.0/go.mod h1:cz+aTbrPOrUb4q7XlbU9ygM+/jj0fzG6c1xBZuNvfVA=
+github.com/prometheus/prometheus v2.5.0+incompatible h1:7QPitgO2kOFG8ecuRn9O/4L9+10He72rVRJvMXrE9Hg=
+github.com/prometheus/prometheus v2.5.0+incompatible/go.mod h1:oAIUtOny2rjMX0OWN5vPR5/q/twIROJvdqnQKDdil/s=
 github.com/prometheus/statsd_exporter v0.21.0 h1:hA05Q5RFeIjgwKIYEdFd59xu5Wwaznf33yKI+pyX6T8=
 github.com/prometheus/statsd_exporter v0.21.0/go.mod h1:rbT83sZq2V+p73lHhPZfMc3MLCHmSHelCh9hSGYNLTQ=
 github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=