Fix code scanning alert no. 157: Insecure randomness

[robfrank]

Fixes https://github.com/ArcadeData/arcadedb/security/code-scanning/157

To fix the problem, we need to replace the usage of java.util.Random with java.security.SecureRandom in the code. This ensures that the random numbers generated are cryptographically secure and suitable for security-sensitive operations.

• Replace instances of new Random() with new SecureRandom().
• Ensure that the import statement for java.security.SecureRandom is added to the file.

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[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.24%	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (f405cc5)	64561	42998	66.60%
Head commit (afadff5)	64561 (+0)	42841 (-157)	66.36% (-0.24%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1917)	1	1	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[robfrank]

LGTM

@lvca WDYT?