pipInstall up-to-date fails when deferring to `pip install -r`

[instilled]

First of all thanks for the great plugin!

We configured pipInstall to use native requirements.txt file. This gives devs the opportunity to work pip install -r requirements.txt on the command line when sourcing the corresponding venv. Unfortunately this leads to pipInstall being always up-to-date after the first run. I believe the issue is with this code, i.e. modulesToInstall is never populated with pip install -r deferred installs. Also, since a requriements.txt can include other requirements.txt files a potential solution ideally also deals with this. Maybe one way to solve is by using pip list to list all installed dependencies when directReqsInstallRequired is true and use that to populate modulesToInstall?

python plugin config:

configure(pythonProjects + listOf(rootProject)) {
    apply(plugin = "ru.vyarus.use-python")
    configure<PythonExtension> {
        pythonBinary = "python3.11"
        scope = PythonExtension.Scope.VIRTUALENV
        installVirtualenv = true
        requirements.use = true
        requirements.file = "requirements.txt"
        requirements.strict = false
        envPath = ".venv"
        // alwaysInstallModules = true  // while not really a fix this solves the problem for the time being.
    }
} 

and the corresponding requirements.txt files:

> cat requirement.txt
-r requirements-prod.txt                               
pytest==7.3.1
pytest-asyncio==0.21.0
pytest-mock==3.10.0
httpx==0.24.1
testcontainers[postgres]==3.7.1

> cat requirements-prod.txt                          
cachetools==5.3.1
CacheControl==0.13.0
dependency-injector==4.41.0
fastapi==0.95.2
matplotlib==3.7.1
numpy==1.24.3
pandas==2.0.2
scipy==1.10.1
pg8000==1.29.4
Pillow==9.5.0
pyaml-env==1.2.1
pydantic-collections==0.4.0
pydantic-yaml==0.11.2
pydantic==1.10.8
python-multipart==0.0.6
SQLAlchemy==2.0.15
starlette==0.27.0
uvicorn[standard]==0.22.0
yoyo-migrations==8.2.0

google-auth==2.19.1
google-cloud-storage==2.9.0
google-cloud-logging==3.5.0
google-cloud-secret-manager==2.16.1
cloud-sql-python-connector[pg8000]==1.2.3

thanks!@