Changes to PUT /v2/vals/:val_id/environment_variables/:key

added the pattern ^[A-Za-z_][A-Z0-9a-z_]*$ to the path request parameter key

for the path request parameter key, the maxLength was set to 8192

api operation id valEnvironmentVariablesCreate removed and replaced with valEnvironmentVariablesUpdate

request property description list-of-types was widened by adding types null to media type application/json

response property updatedAt list-of-types was widened by adding types null to media type application/json of response 201

endpoint added