Allow elixir 1.17.x (backport #11529)

[mergify]

Proposed Changes

Allow elixir 1.17.x when building rabbitmqctl
Tested with Release 3.13.3 and elixir 1.17.1 (OTP26) on OpenBSD

Types of Changes

What types of changes does your code introduce to this project?
Put an x in the boxes that apply

• Bug fix (non-breaking change which fixes issue #NNNN)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause an observable behavior change in existing systems)
• Documentation improvements (corrections, new content, etc)
• Cosmetic change (whitespace, formatting, etc)
• Build system and/or CI

Checklist

• I have read the CONTRIBUTING.md document
• I have signed the CA (see https://cla.pivotal.io/sign/rabbitmq)
• I have added tests that prove my fix is effective or that my feature works
• All tests pass locally with my changes
• If relevant, I have added necessary documentation to https://github.com/rabbitmq/rabbitmq-website
• If relevant, I have added this change to the first version(s) in release-notes that I expect to introduce it

Further Comments

I assume that this qualifies as a trivial change for which no CLA is necessary.
@pivotal-cla This is an Obvious Fix

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This is an automatic backport of pull request #11529 done by Mergify.