Fixed a buffer overflow in gdbr_parse_processes_xml

[suleif0]

Your checklist for this pull request

• I've read the guidelines for contributing to this repository.
• I made sure to follow the project's coding style.
• I've documented every RZ_API function and struct this PR changes.
• I've added tests that prove my changes are effective (required for changes to RZ_API).
• [] I've updated the Rizin book with the relevant information (if needed).
• [] I've used AI tools to generate fully or partially these code changes and I'm sure the changes are not copyrighted by somebody else.

Detailed description

This fixes #5882, The issue was that the cmdline buffer size was too small for some of the data that gdbserver sends with the --multi flag. The fix was to simply increase the buffer size of cmdline.

Test plan

• Start a gdb server: gdbserver --multi :4444
• Connect rizin to the GDB server: rizin -d gdb://localhost:4444
• list the processes: dp

Additionally I made a test for this in test/db/archos/linux-x64/dbg_gdbserver

Closing issues

closes #5882

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 48.11%. Comparing base (5a2e57b) to head (f5c8547).
⚠️ Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
subprojects/rzgdb/src/gdbclient/xml.c	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
subprojects/rzgdb/src/gdbclient/xml.c	42.13% <0.00%> (+42.13%)	⬆️

... and 27 files with indirect coverage changes

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[suleif0]

@notxvilka Can you take a look again?