Fix/shebang

What does this MR do?

Fix the shebang for bash as not all systems have bash in /bin installed.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

Should not have any risk as most of the scripts are already using a correct shebang.