[apache/incubator-teaclave-sgx-sdk] Are git tags being mutated? (#303)

[Adam Szkoda]

Hi 👋 

My cargo dependencies occasionally break in various ways.  While investigating, 
I noticed the `v1.1.3` tag got repointed to a newer commit:
 * Previous one: 
https://github.com/apache/incubator-teaclave-sgx-sdk/commit/254368badb9eb2d4cdab631a34e234bf6e54e585

![image](https://user-images.githubusercontent.com/165678/102764426-68030980-437b-11eb-92b7-b0404e4033da.png)

 * Current one: 
https://github.com/apache/incubator-teaclave-sgx-sdk/commit/a6a172e652b4db4eaa17e4faa078fda8922abdd0

![image](https://user-images.githubusercontent.com/165678/102764449-72bd9e80-437b-11eb-9a5b-f0cc367d621d.png)

Is this intentional?  In my understanding, it's generally assumed that tags, 
once created, do not change.

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