!9743 fix version number after updating ascend package

From: @nicholas_yhr
Reviewed-by: @chujinjin,@zhoufeng54
Signed-off-by: @chujinjin

mindspore/_check_version.py

@@ -122,7 +122,7 @@ class AscendEnvChecker(EnvChecker):
     """ascend environment check"""
 
     def __init__(self):
-        self.version = ["1.76.T20.0.B200"]
+        self.version = ["1.76.T21.0.B210"]
         atlas_nnae_version = "/usr/local/Ascend/nnae/latest/fwkacllib/version.info"
         atlas_toolkit_version = "/usr/local/Ascend/ascend-toolkit/latest/fwkacllib/version.info"
         hisi_fwk_version = "/usr/local/Ascend/fwkacllib/version.info"