Use upstream yaegashi/msgraph.go/msauth (msteams) (#1067)

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diff --git a/vendor/github.com/yaegashi/msgraph.go/msauth/README.md b/vendor/github.com/yaegashi/msgraph.go/msauth/README.md
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+# msauth
+
+## Introduction
+
+Very simple package to authorize applications against [Microsoft identity platform].
+
+It utilizes [v2.0 endpoint] so that it can authorize users using both personal (Microsoft) and organizational (Azure AD) account.
+
+## Usage
+
+### Device authorization grant
+
+- [OAuth 2.0 device authorization grant flow]
+
+```go
+const (
+	tenantID     = "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
+	clientID     = "YYYYYYYY-YYYY-YYYY-YYYY-YYYYYYYYYYYY"
+	tokenCachePath  = "token_cache.json"
+)
+
+var scopes = []string{"openid", "profile", "offline_access", "User.Read", "Files.Read"}
+
+	ctx := context.Background()
+	m := msauth.NewManager()
+	m.LoadFile(tokenCachePath)
+	ts, err := m.DeviceAuthorizationGrant(ctx, tenantID, clientID, scopes, nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+	m.SaveFile(tokenCachePath)
+
+	httpClient := oauth2.NewClient(ctx, ts)
+	...
+```
+
+### Client credentials grant
+
+- [OAuth 2.0 client credentials grant flow]
+
+```go
+const (
+	tenantID     = "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
+	clientID     = "YYYYYYYY-YYYY-YYYY-YYYY-YYYYYYYYYYYY"
+	clientSecret = "ZZZZZZZZZZZZZZZZZZZZZZZZ"
+)
+
+var scopes = []string{msauth.DefaultMSGraphScope}
+
+	ctx := context.Background()
+	m := msauth.NewManager()
+	ts, err := m.ClientCredentialsGrant(ctx, tenantID, clientID, clientSecret, scopes)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	httpClient := oauth2.NewClient(ctx, ts)
+    ...
+```
+
+### Authorization code grant
+
+- [OAuth 2.0 authorization code grant flow]
+- Not yet implemented.
+
+[Microsoft identity platform]: https://docs.microsoft.com/en-us/azure/active-directory/develop/
+[v2.0 endpoint]: https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-overview
+[OAuth 2.0 device authorization grant flow]: https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-oauth2-device-code
+[OAuth 2.0 client credentials grant flow]: https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-oauth2-client-creds-grant-flow
+[OAuth 2.0 authorization code grant flow]: https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-oauth2-auth-code-flow
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