Removed shebangs and exe bits on turtledemo scripts. #18

Job	Run time
Interpreter (Debug)	7m 29s
Free-Threaded (Debug)	10m 44s
i686-pc-windows-msvc/msvc (Debug)	19m 0s
i686-pc-windows-msvc/msvc (Release)	23m 10s
x86_64-pc-windows-msvc/msvc (Debug)	19m 6s
x86_64-pc-windows-msvc/msvc (Release)	24m 47s
aarch64-pc-windows-msvc/msvc (Debug)	5m 8s
aarch64-pc-windows-msvc/msvc (Release)	6m 31s
x86_64-apple-darwin/clang (Debug)	11m 57s
x86_64-apple-darwin/clang (Release)	16m 58s
aarch64-apple-darwin/clang (Debug)	11m 37s
aarch64-apple-darwin/clang (Release)	15m 19s
x86_64-unknown-linux-gnu/gcc (Debug)	8m 38s
x86_64-unknown-linux-gnu/gcc (Release)	12m 34s
x86_64-unknown-linux-gnu/clang (Debug)	8m 23s
x86_64-unknown-linux-gnu/clang (Release)	11m 16s
aarch64-unknown-linux-gnu/gcc (Debug)	1h 9m 47s
aarch64-unknown-linux-gnu/gcc (Release)	48m 54s
aarch64-unknown-linux-gnu/clang (Debug)	1h 4m 20s
aarch64-unknown-linux-gnu/clang (Release)	36m 43s
	7h 12m 21s

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