chore: update akhileshns/heroku-deploy action to v3.14.15

[gdrenovate]

This PR contains the following updates:

Package	Type	Update	Change
akhileshns/heroku-deploy	action	minor	v3.13.15 -> v3.14.15

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Release Notes

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

v3.14.15

Compare Source

• 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

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[gdrenovate]

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