Update dependency firebase-admin to ~2.18

This MR contains the following updates:

Package	Type	Update	Change
firebase-admin (changelog)	dependencies	minor	~2.17 -> ~2.18

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added 3 commits

• 7ef766c7...80e272d4 - 2 commits from branch master
• 03ed465b - Update dependency firebase-admin to ~2.18

Compare with previous version

merged

mentioned in commit 5ac4a497