merge_variables lookup uses deprecated method set_temporary_context()

[felixfontein]

Summary

Templar.set_temporary_context() has been deprecated.

Found with #10540.

Issue Type

Bug Report

Component Name

plugins/lookup/merge_variables.py

Ansible Version

/

Community.general Version

/

Configuration

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OS / Environment

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Steps to Reproduce

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Expected Results

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Actual Results

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Code of Conduct

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[ansibullbot]

Files identified in the description:

• plugins/lookup/merge_variables.py

If these files are incorrect, please update the component name section of the description or use the !component bot command.

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[ansibullbot]

cc @alpex8 @m-a-r-k-e @rlenferink
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[felixfontein]

This is fixed by #10566.