Update ChangeLog for v23.06.0 release

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

Author: troglobit

ChangeLog.md

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+Change Log
+==========
+
+All notable changes to the project are documented in this file.
+
+
+[v23.06.0][] - 2023-06-23
+-------------------------
+
+Midsummer release.  The first official Infix release, based on [Buildroot
+2023.02.2][br2023.02.2], with NETCONF support using the [sysrepo][] and
+[netopeer2][].
+
+Supported YANG models in addition to those used by sysrepo and netopeer:
+
+ - [ietf-system][]
+   - Everything except radius authentication and timezone-utc-offset
+   - Augmented with MotD (Message of the Day), Infix YANG model
+ - [ietf-interfaces][]
+   - [ietf-ip][] augmented with IPv4LL similar to standardized IPv6LL
+   - [ietf-if-vlan-encapsulation][], Linux VLAN interfaces, e.g. `eth0.10`
+   - Linux bridge interfaces with native VLAN support, Infix YANG model
+   - Linux VETH pairs, Infix YANG model
+
+> **DISCLAIMER:** the [Infix YANG models for Linux][yang23.06], are
+> still under heavy development.  New revisions are expected which may
+> not be backwards compatible.  When upgrading to a new release, test on
+> a GNS3 staging environment first, or start over from a factory reset.
+
+[br2023.02.2]:     https://git.busybox.net/buildroot/tag/?h=2023.02.2
+[ietf-system]:     https://www.rfc-editor.org/rfc/rfc7317.html
+[ietf-interfaces]: https://www.rfc-editor.org/rfc/rfc7223.html
+[ietf-ip]:         https://www.rfc-editor.org/rfc/rfc8344.html
+[ietf-if-vlan-encapsulation]: https://www.ietf.org/id/draft-ietf-netmod-sub-intf-vlan-model-08.html
+[yang23.06]:       https://github.com/kernelkit/infix/blob/aea74842e0475441d8df834f2dcd8cbc21fa253d/src/confd/yang/infix-interfaces%402023-06-05.yang
+
+### Changes
+
+ - Bump sysrepo to v2.2.73
+   - Backport support for initializing factory-default data store with
+     default config data also for sysrepo internal modules.
+   - Add support for `sysrepocfg -Cfactory -d running`, for testing
+ - Bump netopeer2 to v2.1.62
+ - Bump libyang to v2.1.80
+ - Add klish, a CLI for sysrepo
+ - Add podman for container support, backported from upstream Buildroot
+ - Add conmon for container support, backported from upstream Buildroot
+ - Backport cni-plugins support for host-local and static plugins
+
+### Fixes
+
+ - N/A
+
+[buildroot]:  https://buildroot.org/
+[UNRELEASED]: https://github.com/kernelkit/infix/compare/v23.06.0...HEAD
+[v23.06.0]:   https://github.com/kernelkit/infix/compare/BASE...v23.06.0
+[sysrepo]:    https://www.sysrepo.org/
+[netopeer2]:  https://github.com/CESNET/netopeer2