Fixed layers for Dockerfile installing gunicorn.

Dockerfile

@@ -1,11 +1,10 @@
-FROM tensorflow/tensorflow:2.5.0
+FROM tensorflow/tensorflow:2.9.1
 ENV PASTEY_WORKERS=2
 ENV PASTEY_THREADS=4
 ENV PASTEY_LISTEN_PORT=5000
-RUN pip install gunicorn
 COPY requirements.txt /app/
 RUN pip install -r /app/requirements.txt
 COPY . /app/
 WORKDIR /app
+RUN pip install gunicorn
 ENTRYPOINT ["sh", "-c", "gunicorn -w $PASTEY_WORKERS -t $PASTEY_THREADS -b :$PASTEY_LISTEN_PORT app:app"]
-EXPOSE $PASTEY_LISTEN_PORT

requirements.txt

@@ -1,4 +1,4 @@
-Flask==1.1.2
+Flask~=2.2.2
-Flask-Limiter==1.4
+Flask-Limiter~=2.6.2
-guesslang==2.2.1
+guesslang-experimental~=2.2.3
-cryptography==3.4.7
+cryptography~=3.4.7