Remove unsupported deprecated tags

[wdawson]

apparently, our validator doesn't like the deprecated tag. Still keeping it in the descriptions:

Run cardinalby/schema-validator-action@v3
Contents of 'engine.dev.yaml' has been parsed as yaml object
"Trying to find 'https://raw.githubusercontent.com/ArcadeAI/schemas/main/engine/config/1.0/schema.json' schema from $schema property of the file...
Schema loaded from https://raw.githubusercontent.com/ArcadeAI/schemas/main/engine/config/1.0/schema.json has undefined type:
Contents of 'https://raw.githubusercontent.com/ArcadeAI/schemas/main/engine/config/1.0/schema.json' has been parsed as json object
Error: Unexpected rules in type "array" at #/properties/tools/properties/toolkits
Error: Failed because of schema error