Updating the OpenVDB source hash

[dcoeurjo]

Update of the mismatched SHA256 hash for the source code.

• Have you followed the guidelines for contributing?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing brew install <formula>)?

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[ilovezfs]

This has to be reported to, and explained by, upstream before we merge it, in order to rule out malicious circumstances.

Please open an issue here: https://github.com/dreamworksanimation/openvdb/issues

[dcoeurjo]

reported in https://github.com/dreamworksanimation/openvdb/issues/172

[dcoeurjo]

Hash confirmed form upstream (see above).

[ilovezfs]

Thanks @dcoeurjo!