Bump actions/attest-build-provenance from 1 to 2 #3548

Job	Run time
Check if database upgrade tests should be run	7s
Build Openfire from source (17, zulu)	4m 18s
check_branch	1s
Build Openfire from source (21, zulu)	3m 59s
Execute Smack-based CI tests	1m 7s
Execute Connectivity CI tests	40s
Execute aioxmpp-based CI tests	1m 42s
Test Postgres Upgrades	1m 0s
Test SQL Server Upgrades	1m 27s
Generate DEB artifact	1m 22s
Test MySQL Upgrades	1m 18s
Publish to GitHub's Docker registry	0s
Publish to Maven	0s
	17m 1s

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