chore(deps-dev): Update mkdocs-material requirement from ~=9.5.14 to ~=9.5.15 in /gh-pages #9260

Job	Run time
Build	7m 17s
Create Release Package	6m 29s
Integration test (jsii-pacmak)	20m 55s
Test (baseline)	15m 13s
Run benchmark suite	32m 47s
Test (Windows)	27m 38s
Test (macOS)	23m 37s
Test (Node 18)	15m 31s
Test (Node 20)	15m 7s
Test (.NET 7.0)	15m 25s
Test (Go 1.19)	15m 20s
Test (Java 11)	15m 37s
Test (Python 3.8)	15m 22s
Test (Python 3.9)	15m 18s
Test (Python 3.10)	16m 51s
Test (Python 3.11)	15m 24s
Unit Tests	1s
	4h 33m 52s

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