deps: update go-getter for redirects fix

[shoenig]

Fixes #7854

Nomad requires a version of go-getter that is currently in PR (hashicorp/go-getter#256)
We also require some recent bug fix to go-getter around the handling of URL redirects.

Update our vendor'd copy of go-getter to the newly rebased umask changes so that we can incorporate
the latest changes for go-getter.

[shoenig]

To reproduce,

$ cat example.nomad 
job "example" {
  datacenters = ["dc1"]

  group "wait" {
    task "sleep" {
      driver = "exec"

      config {
	command = "/bin/sleep"
	args = ["2000"]
      }

      artifact {
	source = "https://github.com/acmesh-official/acme.sh/archive/2.8.5.tar.gz"
	destination = "local/foo"
      }
    }
  }
}

before:

$ nomad alloc status 6e8
ID                  = 6e8b91e2-10e8-80a8-6b80-b6bb31e68dc9
Eval ID             = 397c2740
Name                = example.wait[0]
Node ID             = feee6264
Node Name           = nzxt
Job ID              = example
Job Version         = 0
Client Status       = pending
Client Description  = No tasks have started
Desired Status      = run
Desired Description = <none>
Created             = 19s ago
Modified            = 14s ago
Deployment ID       = 068f8cc5
Deployment Health   = unset

Task "sleep" is "pending"
Task Resources
CPU      Memory   Disk     Addresses
100 MHz  300 MiB  300 MiB  

Task Events:
Started At     = N/A
Finished At    = N/A
Total Restarts = 1
Last Restart   = 2020-05-28T08:37:04-05:00

Recent Events:
Time                       Type                      Description
2020-05-28T08:37:04-05:00  Restarting                Task restarting in 16.150294481s
2020-05-28T08:37:04-05:00  Failed Artifact Download  failed to download artifact "https://github.com/acmesh-official/acme.sh/archive/2.8.5.tar.gz": Error opening a gzip reader for /tmp/getter672924850/archive: EOF
2020-05-28T08:37:04-05:00  Downloading Artifacts     Client is downloading artifacts
2020-05-28T08:37:00-05:00  Task Setup                Building Task Directory
2020-05-28T08:37:00-05:00  Received                  Task received by client

after:

$ nomad alloc status a10
ID                  = a105bec5-c5be-2209-49b1-e3794173b5d6
Eval ID             = 6764baf1
Name                = example.wait[0]
Node ID             = 5a2f17b6
Node Name           = nzxt
Job ID              = example
Job Version         = 0
Client Status       = running
Client Description  = Tasks are running
Desired Status      = run
Desired Description = <none>
Created             = 9s ago
Modified            = 5s ago
Deployment ID       = a2762b62
Deployment Health   = unset

Task "sleep" is "running"
Task Resources
CPU        Memory       Disk     Addresses
0/100 MHz  0 B/300 MiB  300 MiB  

Task Events:
Started At     = 2020-05-28T13:39:03Z
Finished At    = N/A
Total Restarts = 0
Last Restart   = N/A

Recent Events:
Time                       Type                   Description
2020-05-28T08:39:03-05:00  Started                Task started by client
2020-05-28T08:39:02-05:00  Downloading Artifacts  Client is downloading artifacts
2020-05-28T08:38:58-05:00  Task Setup             Building Task Directory
2020-05-28T08:38:58-05:00  Received               Task received by client

[notnoop]

LGTM.

Anything I can help with getting the fix merged into go-getter master? Using the branch was a bit confusing.

[cgbaker]

cherry-picked to 0.11.3

[github-actions]

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