workflows/meta-balena-esr: fix version array bash

[rcooke-warwick]

To fix errors introduced in linting changes https://github.com/balena-os/meta-balena/commit/cd2e5faba65a6598952999953fcd4eb64520ac3a#diff-4910f470eb6744625576b113b4395b6c21b015ecb85544e19d75786abf63f41fL109

Change-type: patch

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• [ ] Changes have been tested
  • [ ] Covered in automated test suite
  • [ ] Manual test case recorded
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[rcooke-warwick]

worked when triggered via dispatch here: https://github.com/balena-os/meta-balena/actions/runs/11481324383