Release v0.26.4

v0.26.4: support `FlowEventScheduledForActivation` event in flow hist…

Release v0.26.3

More CI updates

Release v0.26.2

Release v0.26.2

Release v0.26.1

v0.26.1

Release v0.26.0

Release (minor) 0.26.0 (#403)

* CHANGELOG.md: lint release headers

* CHANGELOG.md: release 0.26.0

* README.md, Release procedure: update semver hints

* 0.26.0

Release v0.25.1

Release v0.25.1

Release v0.25.0

Release v0.25.0

Release v0.24.0

Release v.0.24.0

Release v0.23.2

upadated CHANGELOG.md

Release v0.23.1

Release v0.23.1