Bump helm/chart-testing-action from 2.3.1 to 2.6.1 #83

Job	Run time
Unit tests	2m 33s
Build for Windows (windows, amd64)	1m 19s
Build for Linux (linux, amd64)	31s
Build for Linux (linux, 386)	52s
Linting	1m 57s
WASM build test	0s
Initial tests passed	2s
Upgrade tests	7m 23s
Integration tests	4m 16s
Complement (SQLite native)	3m 58s
Sytest (SQLite native)	4m 43s
Upgrade tests from HEAD-2	7m 19s
Complement (SQLite Cgo)	4m 24s
Sytest (SQLite Cgo)	4m 40s
Complement (PostgreSQL)	9m 0s
Sytest (PostgreSQL)	6m 24s
Integration tests passed	2s
Update Docker images	0s
	59m 23s

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