Update dependency gulp-sass to v5 - abandoned

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gulp-sass	^2.3.2 -> ^5.0.0

By merging this PR, the below issues will be automatically resolved and closed:

Severity	CVSS Score	CVE	GitHub Issue
High	9.8	CVE-2018-1000620	#27
High	9.8	CVE-2018-11499	#22
High	9.8	CVE-2020-7774	#25
High	9.8	CVE-2021-23807	#108
High	9.8	CVE-2021-3918	#109
High	9.8	WS-2020-0344	#41
High	9.1	CVE-2019-10744	#11
High	8.8	CVE-2018-11694	#17
High	8.8	CVE-2018-11695	#18
High	8.8	CVE-2018-11696	#21
High	8.8	CVE-2018-3728	#92
High	8.6	CVE-2021-37701	#141
High	8.6	CVE-2021-37712	#142
High	8.6	CVE-2021-37713	#143
High	8.2	WS-2020-0345	#38
High	8.1	CVE-2018-11693	#28
High	8.1	CVE-2018-11697	#23
High	8.1	CVE-2018-11698	#12
High	8.1	CVE-2021-32803	#140
High	8.1	CVE-2021-32804	#105
High	7.5	CVE-2017-12964	#46
High	7.5	CVE-2018-20834	#54
High	7.5	CVE-2018-3737	#24
High	7.5	CVE-2019-13173	#95
High	7.5	WS-2018-0069	#61
High	7.5	WS-2020-0342	#39
High	7.4	CVE-2020-8203	#69
High	7.2	CVE-2021-23337	#29
Medium	6.5	CVE-2018-19797	#71
Medium	6.5	CVE-2018-19837	#65
Medium	6.5	CVE-2018-19838	#64
Medium	6.5	CVE-2018-19839	#62
Medium	6.5	CVE-2018-20190	#88
Medium	6.5	CVE-2018-20821	#82
Medium	6.5	CVE-2018-20822	#80
Medium	6.5	CVE-2018-21270	#13
Medium	6.5	CVE-2018-3721	#97
Medium	6.5	CVE-2019-1010266	#76
Medium	6.5	CVE-2019-18797	#32
Medium	6.5	CVE-2019-6283	#83
Medium	6.5	CVE-2019-6284	#74
Medium	6.5	CVE-2019-6286	#77
Medium	5.6	CVE-2018-16487	#72
Medium	5.3	CVE-2017-1000048	#14
Medium	5.3	CVE-2017-15010	#7
Medium	5.3	CVE-2017-16137	#20
Medium	5.3	CVE-2018-1107	#91
Medium	5.3	CVE-2020-24025	#48
Medium	5.3	CVE-2020-28500	#53
Medium	5.3	CVE-2020-7608	#86
Medium	5.1	WS-2018-0076	#31
Medium	4.8	WS-2018-0103	#60

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