codespell is trying to fix checksums in go.mod

[tstromberg]

From https://github.com/tinkerbell/tink/pull/514/checks?check_run_id=3484813791

+ xargs codespell -q 3 -I .codespell-whitelist
+ git ls-files
go.sum:1420: Od ==> Of
+ failed=1
+ git ls-files '*.yml' '*.json' '*.md'
+ xargs prettier --check
Checking formatting...
All matched files use Prettier code style!
+ git ls-files '*.sh'
+ xargs shfmt -l -d
+ git ls-files '*.sh'
+ xargs shellcheck
+ nixfmt shell.nix
+ git diff
+ grep .
+ exit 1

We should either exclude go.mod or replace this check with the built-in golangci-lint equivalent.