feat: add OCI artifact manifest type by updating oci spec

[wangxiaoxuan273]

Add OCI artifact manifest type by updating github.com/opencontainers/image-spec module to v1.1.0-rc2. Changes are made by running go mod tidy and go mod vendor.

Part 1 of Issue #21

Signed-off-by: wangxiaoxuan273 [email protected]

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@ff42b8b). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head 1e40eeb differs from pull request most recent head 9981510. Consider uploading reports for the commit 9981510 to get more accurate results

@@           Coverage Diff           @@
##             main      #27   +/-   ##
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  Branches        ?        0           
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  Hits            ?     6200           
  Misses          ?     3954           
  Partials        ?      688           

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[shizhMSFT]

LGTM