Replace deprecated IamAuthenticator constructor by the Builder

[apupier]

Description

Target

• I checked that the commit is targeting the correct branch (Camel 4 uses the main branch)

Tracking

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Apache Camel coding standards and style

• I checked that each commit in the pull request has a meaningful subject line and body.

• I have run mvn clean install -DskipTests locally from root folder and I have committed all auto-generated changes.

[github-actions]

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[github-actions]

🧪 CI tested the following changed modules:

• components/camel-ibm/camel-ibm-watson-discovery
• components/camel-ibm/camel-ibm-watson-language
• components/camel-ibm/camel-ibm-watson-speech-to-text
• components/camel-ibm/camel-ibm-watson-text-to-speech

All tested modules (11 modules)

• Camel :: IBM :: Watson Discovery
• Camel :: IBM :: Watson Language
• Camel :: IBM :: Watson Speech to Text
• Camel :: IBM :: Watson Text to Speech
• Camel :: JBang :: MCP
• Camel :: JBang :: Plugin :: Route Parser
• Camel :: JBang :: Plugin :: TUI
• Camel :: JBang :: Plugin :: Validate
• Camel :: Launcher :: Container
• Camel :: YAML DSL :: Validator
• Camel :: YAML DSL :: Validator Maven Plugin

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