There is no workspace for PHP v7.4

[sauriio]

Description:

While I was building the images for v7.4 of PHP the docker-compose fails to fetch the workspace for this specific version

Expected Behavior:

build with no fails

Context information:

sudo docker-compose build php-fpm php-worker workspace
Building workspace
Step 1/68 : ARG LARADOCK_PHP_VERSION
Step 2/68 : FROM letsdockerize/laradock-workspace:2.4-${LARADOCK_PHP_VERSION}
ERROR: Service 'workspace' failed to build : manifest for letsdockerize/laradock-workspace:2.4-7.4 not found: manifest unknown: manifest unknown

**Output of `docker version`**

Docker version 20.10.3, build 48d30b5

**Output of `docker-compose version`**

docker-compose version 1.27.4, build 40524192

**System info: Mac, Windows or Linux. Include which disto/version**

Linux 5.4.0-65-generic #73-Ubuntu SMP Mon Jan 18 17:25:17 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Xubuntu 20.04

### Steps to reproduce the issue:
<!--- How can we reproduce the issue? -->

1. Set on .env PHP Version to 7.4
2. Build with docker-compose build
3. Fails

### Stacktrace & Additional info:

https://hub.docker.com/r/letsdockerize/laradock-workspace/tags?page=1&ordering=last_updated&name=7.4 there is no builds for 7.4

[calebanthony]

FROM letsdockerize/laradock-workspace

should be

FROM laradock/workspace

Did you manually override this option? The official laradock/workspace image has the 7.4 build.

[bestlong]

@sauriio update your laradock