Remove redundant bash directive. #518

Job	Run time
Unit tests (py39, ubuntu-latest)	3m 51s
Pre-commit checks	32s
Integration tests (py39)	3m 57s
Unit tests (py39, windows-latest)	3m 11s
Integration tests (py310)	4m 18s
Unit tests (py39, macos-latest)	2m 18s
Integration tests (py311)	4m 20s
Unit tests (py310, ubuntu-latest)	3m 36s
Integration tests (py312)	3m 45s
Unit tests (py310, windows-latest)	3m 56s
Integration tests (py313)	4m 14s
Unit tests (py310, macos-latest)	2m 21s
Integration tests (antlr410)	4m 14s
Unit tests (py311, ubuntu-latest)	3m 43s
Integration tests (antlr411)	4m 35s
Unit tests (py311, windows-latest)	2m 55s
Integration tests (antlr412)	3m 50s
Unit tests (py311, macos-latest)	2m 28s
Integration tests (antlr413)	3m 48s
Unit tests (py312, ubuntu-latest)	3m 43s
Integration tests (sa1)	3m 54s
Unit tests (py312, windows-latest)	3m 0s
Integration tests (sa2)	3m 53s
Unit tests (py312, macos-latest)	3m 6s
Unit tests (py313, ubuntu-latest)	3m 46s
Unit tests (py313, windows-latest)	2m 47s
Unit tests (py313, macos-latest)	2m 45s
Unit tests (antlr410, ubuntu-latest)	3m 35s
Unit tests (antlr410, windows-latest)	3m 18s
Unit tests (antlr410, macos-latest)	2m 19s
Unit tests (antlr411, ubuntu-latest)	3m 44s
Unit tests (antlr411, windows-latest)	2m 56s
Unit tests (antlr411, macos-latest)	2m 25s
Unit tests (antlr412, ubuntu-latest)	3m 46s
Unit tests (antlr412, windows-latest)	2m 54s
Unit tests (antlr412, macos-latest)	2m 31s
Unit tests (antlr413, ubuntu-latest)	3m 39s
Unit tests (antlr413, windows-latest)	3m 15s
Unit tests (antlr413, macos-latest)	3m 41s
	2h 10m 49s

Provide feedback