v0.13.0 -- flags skip unhandled types and integral slice flag support

What's Changed

• dependency bump 2023-07-25 by @dfinkel in #81
• flags/pflags: skip registering flags on some types by @dfinkel in #82
• actions: add go 1.21 to testing set by @dfinkel in #83
• parse: add integral-slice type parsing support by @dfinkel in #84
• flag: support for integral slices by @dfinkel in #85
• pflag: add integral-slice and uintptr support by @dfinkel in #86
• go.mod: upgrade dependecies by @dfinkel in #87

Full Changelog: v0.12.0...v0.13.0