Fix: ADIOS2==2.7.1

[ax3l]

ADIOS2 v2.8 introduced breaking operator (compression) changes, which causes issues reading older files.

This resets the update to newes (2.8.0) that came in via #88 for our 0.14.5 release.

• https://github.com/openPMD/openPMD-api/issues/1293
• https://github.com/ornladios/ADIOS2/issues/3273

Checklist

• [x] Used a personal fork of the feedstock to propose changes
• [x] Bumped the build number (if the version is unchanged)
• [ ] Reset the build number to 0 (if the version changed)
• [ ] Re-rendered with the latest conda-smithy (Use the phrase code>@<space/conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• [ ] Ensured the license file is being packaged.

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[github-actions[bot]]

Hi! This is the friendly conda-forge automerge bot!

I considered the following status checks when analyzing this PR:

• linter: passed
• azure: passed

Thus the PR was passing and merged! Have a great day!

[ax3l]

This is fixed in ADIOS 2.8.3+