[skip changelog] Update cobra to latest version (#1430)

* bump github.com/spf13/cobra to 1.2.1

* go mod tidy

* fix CI failing

* update powershell tests, in new version of cobra the completion file is different

Author: umbynos

Diff for: arduino/discovery/discovery_client/go.sum

@@ -6,5 +6,5 @@ replace github.com/arduino/arduino-cli => ../
 
 require (
 	github.com/arduino/arduino-cli v0.0.0-20200109150215-ffa84fdaab21
-	google.golang.org/grpc v1.37.0
+	google.golang.org/grpc v1.38.0
 )

Diff for: client_example/go.mod

@@ -6,6 +6,6 @@ replace github.com/arduino/arduino-cli => ../../..
 
 require (
 	github.com/arduino/arduino-cli v0.0.0-20200109150215-ffa84fdaab21
-	google.golang.org/grpc v1.37.0
+	google.golang.org/grpc v1.38.0
 	google.golang.org/protobuf v1.26.0
 )

Diff for: client_example/go.sum

@@ -7,5 +7,5 @@ replace github.com/arduino/arduino-cli => ../
 
 require (
 	github.com/arduino/arduino-cli v0.0.0
-	github.com/spf13/cobra v1.0.1-0.20200710201246-675ae5f5a98c
+	github.com/spf13/cobra v1.2.1
 )

Diff for: commands/daemon/term_example/go.mod

@@ -33,23 +33,22 @@ require (
 	github.com/segmentio/stats/v4 v4.5.3
 	github.com/sergi/go-diff v1.1.0 // indirect
 	github.com/sirupsen/logrus v1.4.2
-	github.com/spf13/cobra v1.0.1-0.20200710201246-675ae5f5a98c
-	github.com/spf13/jwalterweatherman v1.0.0
-	github.com/spf13/viper v1.6.2
-	github.com/stretchr/testify v1.6.1
+	github.com/spf13/cobra v1.2.1
+	github.com/spf13/jwalterweatherman v1.1.0
+	github.com/spf13/viper v1.8.1
+	github.com/stretchr/testify v1.7.0
 	go.bug.st/cleanup v1.0.0
 	go.bug.st/downloader/v2 v2.1.1
 	go.bug.st/relaxed-semver v0.0.0-20190922224835-391e10178d18
 	go.bug.st/serial v1.1.2
 	go.bug.st/serial.v1 v0.0.0-20180827123349-5f7892a7bb45 // indirect
 	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
 	golang.org/x/net v0.0.0-20210505024714-0287a6fb4125 // indirect
-	golang.org/x/sys v0.0.0-20210503173754-0981d6026fa6 // indirect
 	golang.org/x/text v0.3.6
-	google.golang.org/genproto v0.0.0-20210504143626-3b2ad6ccc450
-	google.golang.org/grpc v1.37.0
+	google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c
+	google.golang.org/grpc v1.38.0
 	google.golang.org/protobuf v1.26.0
 	gopkg.in/mgo.v2 v2.0.0-20180705113604-9856a29383ce // indirect
 	gopkg.in/src-d/go-git.v4 v4.13.1
-	gopkg.in/yaml.v2 v2.3.0
+	gopkg.in/yaml.v2 v2.4.0
 )

Diff for: commands/daemon/term_example/go.sum

@@ -49,8 +49,8 @@ def test_completion_powershell(run_command):
     result = run_command("completion powershell")
     assert result.ok
     assert result.stderr == ""
-    assert "Register-ArgumentCompleter -Native -CommandName 'arduino-cli' -ScriptBlock {" in result.stdout
-    assert "'arduino-cli;completion' {" in result.stdout
+    assert "# powershell completion for arduino-cli" in result.stdout
+    assert "Register-ArgumentCompleter -CommandName 'arduino-cli' -ScriptBlock" in result.stdout
 
 
 def test_completion_bash_no_desc(run_command):