Lower the CPU request for the Affinity Assistant

[jlpettersson]

Changes

1/10th of a core may be too much to request. This may affect how much
TaskRun pods can request, especially on single-core Nodes.

This commit lower the CPU request to 1/20th of a core.

/kind misc

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[jlpettersson]

/test pull-tekton-pipeline-integration-tests

[vdemeester]

/lgtm
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[tekton-robot]

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[vdemeester]

/test pull-tekton-pipeline-integration-tests