Disable colour in tkn logs

[afrittoli]

We use tkn to capture task and pipeline logs from CI runs. By default
the output includes colour, but in a log file the colour codes
make the log less readable, e.g.

I1104 14:45:18.925] [92m[92;1m[client] [0m7ddbc47eeb70: Pulling fs layer

Add the --nocolour flag to avoid that.

Changes

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Double check this list of stuff that's easy to miss:

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[vdemeester]

/lgtm

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[afrittoli]

I wonder why no CI test was executed here? This does not look right.

[vdemeester]

@afrittoli integration did run, the build/unit tests did not as you didn't change any go code or files that are related to those.