Release beku v0.7.1 (2022-01-30)v0.7.1

This is the last release for v0 of beku.
The next release will pivot the beku program to maintain Go versions.

## Chores

*  go.mod: update all dependencies

   This changes affect code that use lib/test.Assert().

*  all: simplify running linter

   Instead of enabling all linters, run the default linter provided by
   the latest golangci-lint.

*  all: replace beku_test in testdata with gitsubmodule

   Previously, the beku_test is bare clone of git repository stored as is.
   This cause an initial clone of the beku repository itself does not
   recognize it as git repository, which make the test fail:

     go test -v -coverprofile=cover.out ./... || rm -f cover.out
     fatal: '/home/ms/go/src/git.sr.ht/~shulhan/beku/testdata/beku_test.git' does not appear to be a git repository
     fatal: Could not read from remote repository.

     Please make sure you have the correct access rights
     and the repository exists.
     2022/01/30 10:56:19 gitInstall: Clone: exit status 128
     FAIL    github.com/shuLhan/beku 0.008s

   This changes make the testdata/beku_test.git as git submodule, to make
   the test run well.

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