chore: prepare 4.6.1 release

[kasia-kujawa]

• chore: prepare 4.6.1 release
• fix docs: change headers Deployment Guide for unreleased version to Deployment Guide for v4.6
• backport of fix(test): get rid of unsafe regular expression for chart version replacing #3626

[swiatekm]

Why are template tests failing?

[kasia-kujawa]

Why are template tests failing?

I'm checking this but I suspect that something changed in test environment, it's weird

        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -27,3 +27,3 @@
        	            	      (string) (len=11) "annotations": (map[string]interface {}) (len=2) {
        	            	-      (string) (len=15) "checksum/config": (string) (len=17) "%CONFIG_CHECKSUM%",
        	            	+      (string) (len=15) "checksum/config": (string) (len=82) "cbd6863a1bb9610%CURRENT_CHART_VERSION%0a88dd6a9b21781a5cbbe4c9076848d3d521f672b50a",

[kasia-kujawa]

template tests are fixed - description in #3626