Sprig templating library is out of date

[tomgoren]

Describe the bug
argo-events uses Sprig v2.22.0 - this prevents us from using useful functions such as fromJson - which are necessary when utilizing SQS as an eventSource.

To Reproduce
Given a parameter in a SQS sensor defined as:

          parameters:
            - src:
                dependencyName: test-dep
                dataTemplate: "{{ index (.Input.body | b64dec | fromJson) \"myKey\" }}"
              dest: spec.arguments.parameters.0.value

Sending a message such as:

aws sqs send-message --queue-url https://sqs.<region>.amazonaws.com/<aws_account_id>/<queue_name> --message-body '{"myKey": "myValue"}'

Results in:

failed to execute the src event template, falling back to key or value. err: template: param:1: function "fromJson" not defined

Expected behavior
The value should be parsed and used to override the parameter defined in the trigger.

Environment (please complete the following information):

• Kubernetes: v1.17.12-eks-7684af
• Argo: v2.12.5
• Argo Events: v1.2.2

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Message from the maintainers:

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[tomgoren]

This worked for us with a build based on #1043