Add expires at in updateConversation context

[shubhamjajoo]

Summary

Fix issue : Context method updateConversation should accept expiration time
#190

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
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[CLAassistant]

All committers have signed the CLA.

[seratch]

Hi @shubhamjajoo, thanks for taking the time to submit this PR! The change looks good me but can you add some tests to https://github.com/slackapi/bolt-js/blob/main/src/conversation-store.spec.ts for verifying the behavior changes?

[shubhamjajoo]

Hi, @seratch , Added the test for the same.

[seratch]

LGTM

[codecov]

Codecov Report

Merging #1221 (52667fe) into main (9feb878) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1221      +/-   ##
==========================================
+ Coverage   73.20%   73.22%   +0.01%     
==========================================
  Files          17       17              
  Lines        1437     1438       +1     
  Branches      431      431              
==========================================
+ Hits         1052     1053       +1     
  Misses        300      300              
  Partials       85       85              

Impacted Files	Coverage Δ
src/conversation-store.ts	100.00% <100.00%> (ø)

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