Fix release script (#4322)

- **PR Description**

- **Please check if the PR fulfills these requirements**

* [ ] Cheatsheets are up-to-date (run `go generate ./...`)
* [ ] Code has been formatted (see
[here](https://github.com/jesseduffield/lazygit/blob/master/CONTRIBUTING.md#code-formatting))
* [ ] Tests have been added/updated (see
[here](https://github.com/jesseduffield/lazygit/blob/master/pkg/integration/README.md)
for the integration test guide)
* [ ] Text is internationalised (see
[here](https://github.com/jesseduffield/lazygit/blob/master/CONTRIBUTING.md#internationalisation))
* [ ] If a new UserConfig entry was added, make sure it can be
hot-reloaded (see
[here](https://github.com/jesseduffield/lazygit/blob/master/docs/dev/Codebase_Guide.md#using-userconfig))
* [ ] Docs have been updated if necessary
* [ ] You've read through your own file changes for silly mistakes etc

<!--
Be sure to name your PR with an imperative e.g. 'Add worktrees view'
see https://github.com/jesseduffield/lazygit/releases/tag/v0.40.0 for
examples
-->

.github/workflows/release.yml

@@ -75,7 +75,7 @@ jobs:
       - name: Calculate next version
         run: |
           echo "Latest tag: ${{ env.latest_tag }}"
-          IFS='.' read -r major minor patch <<< "${env.latest_tag#v}"
+          IFS='.' read -r major minor patch <<< "${{ env.latest_tag }}"
 
           if [[ "${{ github.event_name }}" == "workflow_dispatch" ]]; then
             if [[ "${{ inputs.version_bump }}" == "patch" ]]; then