Bump GabrielBB/xvfb-action from 1.6 to 1.7 #1162

Job	Run time
Check Python types	3m 7s
Python Tests (ubuntu-latest, 3.8)	1m 39s
Test Positron IPyKernel (ubuntu-latest, 3.8)	2m 58s
Python Tests (ubuntu-latest, 3.12)	1m 46s
Lint	4m 0s
Test Positron IPyKernel (macos-latest, 3.9)	2m 9s
Test Positron IPyKernel (windows-latest, 3.10)	5m 37s
Test Minimum Positron IPyKernel Dependencies (ubuntu-latest, 3.8)	3m 29s
Test TypeScript (ubuntu-latest, 3.x, ts-unit)	3m 14s
Test TypeScript (ubuntu-latest, 3.x, functional)	4m 19s
Test Positron IPyKernel (ubuntu-latest, 3.11)	3m 5s
Test Positron IPyKernel (ubuntu-latest, 3.12)	2m 57s
Test TypeScript (macos-latest, 3.x, ts-unit)	3m 20s
Test TypeScript (macos-latest, 3.x, venv)	4m 1s
Test TypeScript (macos-latest, 3.x, single-workspace)	3m 23s
Test TypeScript (macos-latest, 3.x, debugger)	2m 42s
Test TypeScript (macos-latest, 3.x, functional)	3m 59s
Test TypeScript (macos-latest, 3.x, smoke)	3m 19s
Test TypeScript (windows-latest, 3.x, ts-unit)	6m 38s
Test TypeScript (windows-latest, 3.x, functional)	6m 44s
	1h 12m 26s

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