Bump github.com/cenkalti/backoff/v3 from 3.1.1 to 3.2.1 (#70)

Bumps [github.com/cenkalti/backoff/v3](https://github.com/cenkalti/backoff) from 3.1.1 to 3.2.1.
- [Release notes](https://github.com/cenkalti/backoff/releases)
- [Commits](cenkalti/backoff@v3.1.1...v3.2.1)

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

go.mod

@@ -3,7 +3,7 @@ module github.com/ullaakut/astronomer
 go 1.12
 
 require (
-	github.com/cenkalti/backoff/v3 v3.1.1
+	github.com/cenkalti/backoff/v3 v3.2.1
 	github.com/fatih/color v1.7.0 // indirect
 	github.com/kennygrant/sanitize v1.2.4
 	github.com/mattn/go-colorable v0.1.2 // indirect

go.sum

@@ -16,6 +16,8 @@ github.com/cenkalti/backoff/v3 v3.0.0 h1:ske+9nBpD9qZsTBoF41nW5L+AIuFBKMeze18XQ3
 github.com/cenkalti/backoff/v3 v3.0.0/go.mod h1:cIeZDE3IrqwwJl6VUwCN6trj1oXrTS4rc0ij+ULvLYs=
 github.com/cenkalti/backoff/v3 v3.1.1 h1:UBHElAnr3ODEbpqPzX8g5sBcASjoLFtt3L/xwJ01L6E=
 github.com/cenkalti/backoff/v3 v3.1.1/go.mod h1:cIeZDE3IrqwwJl6VUwCN6trj1oXrTS4rc0ij+ULvLYs=
+github.com/cenkalti/backoff/v3 v3.2.1 h1:Sn5hAjy0uGtHq/sAp1vBKyS9GCFaQOrrkyFQN0Sk5dM=
+github.com/cenkalti/backoff/v3 v3.2.1/go.mod h1:cIeZDE3IrqwwJl6VUwCN6trj1oXrTS4rc0ij+ULvLYs=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=