chore: use new API for setting epoch secret WPB-261

[typfel]

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PR Submission Checklist for internal contributors

• The PR Title

  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • contains a reference JIRA issue number like SQPIT-764
  • answers the question: If merged, this PR will: ... ³

• The PR Description

  • is free of optional paragraphs and you have filled the relevant parts to the best of your ability

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What's new in this PR?

Issues

No audio in MLS conferences between Web & Android

Causes

Web base64 encodes the epoch secret they give to AVS

Solutions

Align with Web by base64 encoding the epoch secret

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PR Post Submission Checklist for internal contributors (Optional)

• Wire's Github Workflow has automatically linked the PR to a JIRA issue

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PR Post Merge Checklist for internal contributors

• If any soft of configuration variable was introduced by this PR, it has been added to the relevant documents and the CI jobs have been updated.

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References

1. https://sparkbox.com/foundry/semantic_commit_messages
2. https://github.com/wireapp/.github#usage
3. E.g. feat(conversation-list): Sort conversations by most emojis in the title #SQPIT-764.

[github-actions]

Unit Test Results

   285 files   - 108     285 suites   - 108   11s ⏱️ - 2m 3s
1 459 tests  - 633  1 426 ✔️  - 579  33 💤  - 54  0 ❌ ±0 

Results for commit 3f1898f. ± Comparison against base commit 1aabb47.

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

Merging #1752 (3f1898f) into develop (1aabb47) will increase coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop    #1752   +/-   ##
==========================================
  Coverage      54.62%   54.62%           
  Complexity      1625     1625           
==========================================
  Files           1006     1006           
  Lines          36862    36862           
  Branches        3301     3301           
==========================================
+ Hits           20135    20136    +1     
  Misses         15367    15367           
+ Partials        1360     1359    -1     

Impacted Files	Coverage Δ
...mAndroid/kotlin/com.wire.kalium.calling/Calling.kt	0.00% <ø> (ø)

... and 1 file with indirect coverage changes

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