Update akhileshns/heroku-deploy action to v3.15.15

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
akhileshns/heroku-deploy	action	minor	v3.12.12 → v3.15.15

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Release Notes

akhileshns/heroku-deploy (akhileshns/heroku-deploy)

v3.15.15

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• Bumped Node version to 24 (courtesy of @​papotte)

v3.14.15

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• Fix stack issue (courtesy of @​sstepanchuk)
• Add dotenv dependency (courtesy of @​sstepanchuk)
• Update documentation to more precisely mention that the heroku cli must be installed

v3.13.15

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Updated node version to "node20" (as "node18" is not supported by GitHub Actions)

v3.13.14

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Updated node version from 16 to 18 (as 16 is causing problems due to deprecation)

v3.12.14

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• Updated @​actions/core version to >1.10.0 to fix setOutput call problems in the future

(Thanks to @​arg, @​clickclickonsal, @​romack and @​fabn for the suggestion)

v3.12.13

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Switched to node 16 due to deprecation of node 12 (Thank you to @​brtrick for PR)

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