add net::http import to lti_helper

[pretendWhale]

Motivation and Context

In production mode, the net/http module is not loaded by default in jobs/helpers. In contrast, net/http is loaded by default in development. This PR adds an explicit require 'net/http' invocation to lti_helper.rb similar to automated_tests_helper.rb.

Your Changes

Description:
Add require to lti_helper.rb

Type of change (select all that apply):

• Bug fix (non-breaking change which fixes an issue)

Testing

Tested in our staging environment on ben - because NET::HTTP is loaded on development, it works there without issue.

Questions and Comments (if applicable)

Checklist

• I have performed a self-review of my own code.
• I have verified that the pre-commit.ci checks have passed.
• I have verified that the CI tests have passed.
• I have reviewed the test coverage changes reported on Coveralls.

Pull request to make documentation changes (if applicable)

[coveralls]

Pull Request Test Coverage Report for Build 7547851117

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 91.68%

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Totals
Change from base Build 7544170828:	0.0%
Covered Lines:	38761
Relevant Lines:	41657

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💛 - Coveralls