build(deps): bump slang from `eaaf3e4` to `7c6b2b0` #390

Job	Run time
Build with Pip (windows-latest, 3.11)	10m 47s
Build with Pip (windows-latest, pypy-3.9)	10m 4s
Build with Pip (macos-latest, 3.11)	3m 3s
Build with Pip (macos-latest, pypy-3.9)	3m 29s
Build with Pip (ubuntu-latest, 3.11)	6m 38s
Build with Pip (ubuntu-latest, pypy-3.9)	7m 5s
	41m 6s

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