Documentation update.|Released to be visible on pkg.go.dev

tests: replaced stretchr/testify by go-openapi/testify

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>

updated linting rules

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>

ci: fixed auto-merge

Signed-off-by: Frédéric BIDON <fredbi@yahoo.com>

ci: fixed codecov upload

Fixed broken test coverage upload to codecov with codecov-action@v5.

    * fixed tokenless upload (now supported with codecov v5)
    * fixed flags for codecov
    * fixed coverage for windows (now use bash instead of powershell)

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>

chore(go): go-openapi requires go.1.20 across the board

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>

chore(lint): relinted tests

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>