chore(deps): update dependencies and Go version (#109)

This commit updates several dependencies to their latest versions and
bumps the Go toolchain to 1.24.6.

The kingpin library is updated to v2.4.0 and its import path is changed
from the gopkg.in vanity URL to github.com/alecthomas/kingpin/v2.

The goreleaser CI workflow has been changed to create draft releases
instead of final releases.

Update go.mod dependencies (#66)

Bump deps and Go versions (#63)

Upgrade release build to use Go 1.20.x.
Bump go.mod deps.
Add testing on Go 1.21.
Remove usage of deprecated io/ioutil.

Prepare 0.5.0 release (#58)

Match the previous release matrix from gox

Use goreleaser for release builds (#50)

Format env var as code in readme

Add an artifact for Apple M1 (darwin/arm64) (#42)

Prepare v0.3.1 release

Update Go version to 1.16beta1

Add macOS arm64 example.
Add go1.16 to list of branches to test.