* gha: fix workflow by allowing the composer-normalize plugin
We don't need to enable it in the project itself, but at least in this
workflow which explicitly uses it.
See https://github.com/barryvdh/laravel-ide-helper/actions/runs/3980013548/jobs/6822812621#step:4:34
```
Error: ergebnis/composer-normalize (installed globally) contains a Composer plugin which is blocked by your allow-plugins config. You may add it to the list if you consider it safe.
You can run "composer global config --no-plugins allow-plugins.ergebnis/composer-normalize [true|false]" to enable it (true) or disable it explicitly and suppress this exception (false)
```
* gha: also run this workflow when it is changed itself
* gha: be more specific which OS to use
Avoids "surprises" when Github changes the underlying version, like they
currently announce with a warning:
> Ubuntu-latest workflows will use Ubuntu-20.04 soon. For more details, see https://github.com/actions/virtual-environments/issues/1816
Note: basically right now "latest" is actually 18.04 and not 20.04
* composer fix-style
* gha: require league/flysystem:^1 for lumen
2.* doesn't work out of the box
* gha: explicit version of composer isn't necessary anymore
v2 is already the default
* Be explicit to require the pdo SQLite extension for tests
Co-authored-by: laravel-ide-helper <[email protected]>
Markus Podar
dependabot[bot]anddependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
erikn69
Tom Witkowski