[BUG] Cannot setup junit jar using `NeotestJava setup` on v0.11.5

[rcasia]

NeoVim Version
NVIM v0.11.5

Describe the bug

Error executing Lua callback: Vim:E976: Using a Blob as a String
stack traceback:
	[C]: in function 'sha256'
	...hare/nvim/lazy/neotest-java/lua/neotest-java/install.lua:11: in function 'checksum'
	...hare/nvim/lazy/neotest-java/lua/neotest-java/install.lua:42: in function 'install'
	...l/share/nvim/lazy/neotest-java/lua/neotest-java/init.lua:121: in function 'install'
	...cal/share/nvim/lazy/neotest-java/plugin/neotest-java.lua:6: in function 'fun'
	...cal/share/nvim/lazy/neotest-java/plugin/neotest-java.lua:12: in function <...cal/share/nvim/lazy/neotest-java/plugin/neotest-java.lua:10>

Steps to reproduce the behavior:

run :NeotestJava setup

Expected behavior
Download junit jar

Additional context
based on comment #248 (comment)

[rcasia]

It occurs on current stable NVIM v0.11.5, but not in current nightly.