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fix(sandbox): take heel 0.10.1 so a freshly written script always runs - #772
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A script written into the working directory and run straight away sometimes exited 126 on Linux. The exec hit ETXTBSY: heel's broker resumed the caller while it still held its own copy of the file the caller had opened for writing. heel 0.10.1 installs the descriptor first, closes the broker's copy, and only then resumes the caller. This moves the library and the pinned heel binaries to 0.10.1. The script test now prints the shell's stderr when it fails.
Closes #767