Golang cmd: do not use non-constant formatting strings in printf-like calls

Do not use non-constant formatting strings in calls to printf-like functions in src/cmd. These fail the new printf vet check (#60529).

cc @adonovan

Comment From: gabyhelp

Related Issues and Documentation

• cmd/vet: report printf calls with non-const format and no args #60529 (closed)

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Comment From: gopherbot

Change https://go.dev/cl/610538 mentions this issue: cmd: fix formatting strings

Comment From: timothy-king

The required work is a subset of the work for #68796. Closing this as a duplicate.