Adapt instructions to new branching and versioning strategy

.github/ISSUE_TEMPLATE/release.md

@@ -13,9 +13,9 @@ labels: ["release"]
 
 ### At the beginning of the cycle
 
-- [ ] Create a new `release-v0.5x.0` long-lived branch and add a new release notes file using the available [template](https://github.com/grafana/k6/blob/master/release%20notes/template.md) to the [repository's `release notes` folder](https://github.com/grafana/k6/blob/master/release%20notes).
+- [ ] Create a new `release-v{major}.{minor}.0` branch and add a new release notes file using the available [template](https://github.com/grafana/k6/blob/master/release%20notes/template.md) to the [repository's `release notes` folder](https://github.com/grafana/k6/blob/master/release%20notes).
 - [ ] Go through the potential [dependencies updates](https://github.com/grafana/k6/blob/master/Dependencies.md) and create a dedicated PR if any of them is relevant to this release.
-- [ ] Create a new `release-v0.5x.0` long-lived branch on the [grafana/k6-DefinitelyTyped](https://github.com/grafana/k6-DefinitelyTyped) fork repository.
+- [ ] Create a new `release-v{major}.{minor}.0` branch on the [grafana/k6-DefinitelyTyped](https://github.com/grafana/k6-DefinitelyTyped) fork repository.
     - [ ] Bump the version in [types/k6/package.json](https://github.com/grafana/k6-DefinitelyTyped/blob/master/types/k6/package.json#L4) to the next one.
 
 ### Release Preparation
@@ -45,15 +45,16 @@ labels: ["release"]
 
 #### Documentation
 
-- [ ] Open and merge a pull-request from `main` in the `k6-docs` repository, copying the current k6's `next` to a folder named with the k6 version (e.g. `v0.48.x`).
+- [ ] Open and merge a pull-request from `main` in the `k6-docs` repository, copying the current k6's `next` to a folder named with the k6 version (e.g. `v0.55.x`).
 - [ ] Ensure the k6 repository release notes PR contains the correct links to the docs.
 
 #### In k6 repository
 
 - [ ] Merge the PR bumping [the k6 Go project's version](https://github.com/grafana/k6/blob/master/lib/consts/consts.go#L11-L12).
 - [ ] Merge the release notes PR.
 - [ ] Pull locally the previously merged changes.
-- [ ] Create and push a new tag of the form `vX.Y.Z` using git: `git tag v0.5x.0 -m "v0.5x.0"`.
+- [ ] Create a new long-lived `v{major}.{minor}.x` release branch from the `main` branch.
+- [ ] Checkout the new `v{major}.{minor}.x` release branch, create and push a new tag of the form `v{major}.{minor}.0` using git: _e.g._ `git tag v0.55.0 -m "v0.55.0"`.
 
 #### Announcements