fix: deprecate python36 from chalice (#539)

* fix: Use FORBID_ENCRYPT_ALLOW_DECRYPT policy for decrypt oracle

* fix: pin tox version < 4.0

* Update decrypt_oracle/src/aws_encryption_sdk_decrypt_oracle/app.py

Co-authored-by: seebees <ryanemer@amazon.com>

* fix: change forward-slashes to pound for comment

* fix: linting issue - ran autoformatter

* fix: deprecate python36 from chalice

* Update decrypt_oracle/tox.ini

Co-authored-by: Tony Knapp <5892063+texastony@users.noreply.github.com>

* Update decrypt_oracle/tox.ini

Co-authored-by: Tony Knapp <5892063+texastony@users.noreply.github.com>

* Update decrypt_oracle/tox.ini

Co-authored-by: Tony Knapp <5892063+texastony@users.noreply.github.com>

* Update decrypt_oracle/tox.ini

Co-authored-by: Tony Knapp <5892063+texastony@users.noreply.github.com>

Co-authored-by: Shubham Chaturvedi <scchatur@amazon.com>
Co-authored-by: seebees <ryanemer@amazon.com>
Co-authored-by: Tony Knapp <5892063+texastony@users.noreply.github.com>

decrypt_oracle/.chalice/buildspec.yaml

@@ -2,7 +2,7 @@ version: 0.2
 phases:
   install:
     commands:
-      - pip install tox
+      - pip install "tox < 4.0"
   build:
     commands:
       - cd decrypt_oracle

decrypt_oracle/.chalice/pipeline.py

@@ -23,7 +23,7 @@
 
 APPLICATION_NAME = "AwsEncryptionSdkDecryptOraclePython"
 PIPELINE_STACK_NAME = "{}DeployPipeline".format(APPLICATION_NAME)
-CODEBUILD_IMAGE = "aws/codebuild/python:3.6.5"
+CODEBUILD_IMAGE = "aws/codebuild/standard:5.0"
 BUILDSPEC = "decrypt_oracle/.chalice/buildspec.yaml"
 GITHUB_REPO = "aws-encryption-sdk-python"
 WAITER_CONFIG = dict(Delay=10)