chore(ci): remove Busy Engineer's Workshop from release validation

Author: lucasmcdonald3

codebuild/release/validate.yml

@@ -1,21 +1,22 @@
 version: 0.2
-
 phases:
   install:
+    commands:
+      - pip install "tox < 4.0"
     runtime-versions:
       python: latest
+  pre_build:
     commands:
-      - python -m pip install --upgrade pip
+      - pyenv install --skip-existing 3.8.12
+      - pyenv local 3.8.12
+      - pip install "tox < 4.0"
   build:
     commands:
       - NUM_RETRIES=3
       - |
         while [ $NUM_RETRIES -gt 0 ]
         do
-          pip install "aws-encryption-sdk==$VERSION" \
-            && python -c "import aws_encryption_sdk; \
-                          from aws_encryption_sdk import StrictAwsKmsMasterKeyProvider; \
-                          print('aws-encryption-sdk', aws_encryption_sdk.__version__, 'installed and imports cleanly')"
+          pip install "aws-encryption-sdk==$VERSION" && python -c "import aws_encryption_sdk; from aws_encryption_sdk import StrictAwsKmsMasterKeyProvider"
           if [ $? -eq 0 ]; then
             break
           fi