Update go dependencies (#4524)

vendor/github.com/onsi/gomega/gexec/build.go

@@ -1,3 +1,5 @@
+// untested sections: 5
+
 package gexec
 
 import (
@@ -66,7 +68,7 @@ func doBuild(gopath, packagePath string, env []string, args ...string) (compiled
 
 	executable := filepath.Join(tmpDir, path.Base(packagePath))
 	if runtime.GOOS == "windows" {
-		executable = executable + ".exe"
+		executable += ".exe"
 	}
 
 	cmdArgs := append([]string{"build"}, args...)

vendor/github.com/onsi/gomega/gexec/exit_matcher.go

@@ -1,3 +1,5 @@
+// untested sections: 2
+
 package gexec
 
 import (

vendor/github.com/onsi/gomega/gexec/prefixed_writer.go

@@ -1,3 +1,5 @@
+// untested sections: 1
+
 package gexec
 
 import (
@@ -6,7 +8,7 @@ import (
 )
 
 /*
-PrefixedWriter wraps an io.Writer, emiting the passed in prefix at the beginning of each new line.
+PrefixedWriter wraps an io.Writer, emitting the passed in prefix at the beginning of each new line.
 This can be useful when running multiple gexec.Sessions concurrently - you can prefix the log output of each
 session by passing in a PrefixedWriter:
 

vendor/github.com/onsi/gomega/gexec/session.go

@@ -1,6 +1,9 @@
 /*
 Package gexec provides support for testing external processes.
 */
+
+// untested sections: 1
+
 package gexec
 
 import (