Bump chainguard-dev/actions/setup-gitsign from 1.6.25 to 1.6.26 #4672

Job	Run time
Database Integration Tests (trino)	6m 20s
Database Integration Tests (db2)	12m 5s
Database Integration Tests (mariadb)	5m 48s
Database Integration Tests (informix)	5m 43s
Database Integration Tests (postgresql)	7m 9s
Database Integration Tests (mysql)	1m 17s
Database Integration Tests (oracle)	12m 36s
Database Integration Tests (clickhouse)	6m 41s
Database Integration Tests (firebird)	5m 9s
Database Integration Tests (sqlserver)	6m 56s
Database Integration Tests (cassandra)	4m 54s
	1h 14m 38s

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