fix: modified parts of code related to docker and versioning

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.8-slim
+FROM cloudforet/python-core:1
 
 ENV PYTHONUNBUFFERED 1
 ENV SPACEONE_PORT 50051

pkg/pip_requirements.txt

@@ -1,4 +1 @@
-spaceone-core
-spaceone-api
-spaceone-tester
 schematics

src/setup.py

@@ -16,25 +16,20 @@
 
 from setuptools import setup, find_packages
 
-with open('VERSION', 'r') as f: 
+with open("VERSION", "r") as f:
     VERSION = f.read().strip()
     f.close()
 
 setup(
-    name='plugin-aws-sns-monitoring-webhook',
+    name="plugin-aws-sns-monitoring-webhook",
     version=VERSION,
-    description='AWS SNS monitoring Webhook',
-    long_description='',
-    url='https://www.spaceone.dev/',
-    author='MEGAZONE SpaceONE Team',
-    author_email='[email protected]',
-    license='Apache License 2.0',
+    description="AWS SNS monitoring Webhook",
+    long_description="",
+    url="https://www.spaceone.dev/",
+    author="MEGAZONE SpaceONE Team",
+    author_email="[email protected]",
+    license="Apache License 2.0",
     packages=find_packages(),
-    install_requires=[
-        'spaceone-core',
-        'spaceone-api',
-        'spaceone-tester',
-        'schematics'
-    ],
+    install_requires=["spaceone-api"],
     zip_safe=False,
 )