fix: microshift e2e test failures on merge

[anithapriyanatarajan]

Changes

This pull request makes a minor updates the curl command in test/microshift_test.sh to use the -L flag, ensuring HTTP redirects are followed when downloading the Tekton Pipeline release manifest. This resolves the failures of https://github.com/tektoncd/chains/actions/workflows/test-on-microshift.yaml during PR merge.

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Has Docs included if any changes are user facing
• Has Tests included if any functionality added or changed
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  functionality, content, code)
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Release Notes

NONE

/kind bug

[jkhelil]

/approve

[jkhelil]

/lgtm

[tekton-robot]

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