Build failed on macOS: spark.version: syntax error: invalid arithmetic operator

[xumingming]

Describe the bug
Build failed on macOS:
To Reproduce

(base) ➜  auron git:(master) ./auron-build.sh --pre --sparkver 3.3 --scalaver 2.12
./auron-build.sh: line 398: spark.version: syntax error: invalid arithmetic operator (error token is ".version")

Expected behavior

Screenshots

Additional context

[xumingming]

It seems seems that associative array is only supported in Bash 4.0+, while the bash in my macOS is 3.2.57, My macOS version is relative new(15.3.2), so I think it is worthy to remove the dependency on bash 4.0

(base) ➜  auron git:(master) ✗ bash --version
GNU bash, version 3.2.57(1)-release (arm64-apple-darwin24)
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