update the dependecy for scaleway sdk

[nicolai86]

again maintainability update.

once the tests are green I'll merge this optimistically.

[nicolai86]

tests are green:

$ make testacc
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test $(go list ./... |grep -v 'vendor') -v  -timeout 120m
?     github.com/terraform-providers/terraform-provider-scaleway  [no test files]
=== RUN   TestAccScalewayDataSourceBootscript_Filtered
--- PASS: TestAccScalewayDataSourceBootscript_Filtered (11.49s)
=== RUN   TestAccScalewayDataSourceImage_Basic
--- PASS: TestAccScalewayDataSourceImage_Basic (26.12s)
=== RUN   TestAccScalewayDataSourceImage_Filtered
--- PASS: TestAccScalewayDataSourceImage_Filtered (29.64s)
=== RUN   TestAccScalewayIP_importBasic
--- PASS: TestAccScalewayIP_importBasic (9.89s)
=== RUN   TestAccScalewaySecurityGroup_importBasic
--- PASS: TestAccScalewaySecurityGroup_importBasic (9.52s)
=== RUN   TestAccScalewayServer_importBasic
--- PASS: TestAccScalewayServer_importBasic (129.65s)
=== RUN   TestAccScalewayVolume_importBasic
--- PASS: TestAccScalewayVolume_importBasic (8.88s)
=== RUN   TestProvider
--- PASS: TestProvider (0.00s)
=== RUN   TestProvider_impl
--- PASS: TestProvider_impl (0.00s)
=== RUN   TestAccScalewayIP_Count
--- PASS: TestAccScalewayIP_Count (17.04s)
=== RUN   TestAccScalewayIP_Basic
--- PASS: TestAccScalewayIP_Basic (53.64s)
=== RUN   TestAccScalewaySecurityGroupRule_Basic
--- PASS: TestAccScalewaySecurityGroupRule_Basic (25.10s)
=== RUN   TestAccScalewaySecurityGroupRule_Count
--- PASS: TestAccScalewaySecurityGroupRule_Count (23.33s)
=== RUN   TestAccScalewaySecurityGroup_Basic
--- PASS: TestAccScalewaySecurityGroup_Basic (10.16s)
=== RUN   TestAccScalewayServer_Basic
--- PASS: TestAccScalewayServer_Basic (155.60s)
=== RUN   TestAccScalewayServer_ExistingIP
--- PASS: TestAccScalewayServer_ExistingIP (166.85s)
=== RUN   TestAccScalewayServer_Volumes
--- PASS: TestAccScalewayServer_Volumes (147.77s)
=== RUN   TestAccScalewayServer_SecurityGroup
--- PASS: TestAccScalewayServer_SecurityGroup (167.06s)
=== RUN   TestGetSSHKeyFingerprint
--- PASS: TestGetSSHKeyFingerprint (0.00s)
=== RUN   TestAccScalewaySSHKey_Basic
--- PASS: TestAccScalewaySSHKey_Basic (38.64s)
=== RUN   TestAccScalewayVolumeAttachment_Basic
--- PASS: TestAccScalewayVolumeAttachment_Basic (477.82s)
=== RUN   TestAccScalewayVolume_Basic
--- PASS: TestAccScalewayVolume_Basic (10.89s)
PASS
ok    github.com/terraform-providers/terraform-provider-scaleway/scaleway  1519.132s