Update dependency svgicons2svgfont to v15 #66913

Job	Run time
Copied files are in sync	5s
detect changed files	7s
Changelogger use	14s
Changelogger validity	26s
Project structure	1m 29s
PHP lint (7.2)	27s
PHP lint (7.4)	29s
PHP lint (8.0)	28s
ESLint (non-excluded files only)	3m 17s
PHP lint (8.1)	36s
PHP lint (8.2)	39s
PHP lint (8.3)	29s
PHP lint (8.4)	41s
PHP Code Sniffer (non-excluded files only)	0s
PHP Compatibility	0s
ESLint (changes to excluded files only)	0s
Check linter exclude lists	1m 51s
Lint GitHub Actions yaml files	0s
PHP Code Sniffer (changes to excluded files only)	0s
Lock files are up to date	1m 30s
Monorepo package version refs	59s
	13m 47s

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