fix: Removed trailing slash for conversations URIs

[dragonmantank]

fix: Removed trailing slashes on conversation URIs

Bumped to 9.12.0 for release

Describe your changes here

Contribution Checklist

• Unit tests!
• Updated CHANGELOG.md
• My name is in CONTRIBUTORS.md

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.05%. Comparing base (a9c514d) to head (a8828c4).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #626   +/-   ##
=========================================
  Coverage     99.05%   99.05%           
  Complexity     3643     3643           
=========================================
  Files           548      548           
  Lines          8051     8052    +1     
  Branches        444      445    +1     
=========================================
+ Hits           7975     7976    +1     
  Misses           56       56           
  Partials         20       20           

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[Copilot]

Pull request overview

Removes trailing slashes from Vonage Conversations API request URIs (to match current API gateway routing behavior) and bumps the SDK version for release.

Changes:

• Strips a trailing / from Conversations API endpoint URLs at request-build time.
• Updates Conversations client endpoint tests to expect non-trailing-slash URIs.
• Bumps version references from 9.11.0 to 9.12.0 in code and documentation.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/main/java/com/vonage/client/conversations/ConversationsClient.java	Normalizes Conversations endpoint URLs by removing a trailing slash before sending requests.
src/test/java/com/vonage/client/conversations/ConversationsClientTest.java	Updates expected endpoint URIs to match the new non-trailing-slash behavior.
src/main/java/com/vonage/client/HttpWrapper.java	Updates the SDK client version string to 9.12.0.
pom.xml	Bumps project version to 9.12.0.
README.md	Updates dependency snippets to 9.12.0.

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