dist/tools/bmp: fix target parsing

[maribu]

Contribution description

Either GDB or pygdbmi changed behavior to trim off whitespace following the message, resulting in the \\n at the end of the regex no longer matching. This replaces the \\n with \s* to match both old and new output.

Fixes: #20604

Testing procedure

Run make BOARD=nrf52840dk PROGRAMMER=bmp flash with a black magic probe, a cheaper Jeff Probe, or an even cheaper ST-Link V2 clone with BMP firmware flashed used as debugger.

In master this yields (with recent version of GDB and pygdbmi installed):

found following Black Magic GDB servers:
	[/dev/ttyACM0] Serial: 3D8E4CC3 <- default 
connecting to [/dev/ttyACM0]...
connecting successful.
scanning using SWD...
res = [{'type': 'log', 'message': None, 'payload': 'monitor swdp_scan\n', 'stream': 'stdout'}, {'type': 'target', 'message': None, 'payload': 'Target voltage: 3.0V\n', 'stream': 'stdout'}]
targets = []
Traceback (most recent call last):
  File "/home/maribu/Repos/software/RIOT/master/dist/tools/bmp/bmp.py", line 272, in <module>
    gdbmi = connect_to_target(port)
            ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/maribu/Repos/software/RIOT/master/dist/tools/bmp/bmp.py", line 245, in connect_to_target
    assert len(targets) > 0, "no targets found"
           ^^^^^^^^^^^^^^^^
AssertionError: no targets found
make: *** [/home/maribu/Repos/software/RIOT/master/examples/hello-world/../../Makefile.include:849: flash] Error 1

With this PR, this yields:

found following Black Magic GDB servers:
	[/dev/ttyACM0] Serial: 3D8E4CC3 <- default 
connecting to [/dev/ttyACM0]...
connecting successful.
scanning using SWD...
found following targets:
	Nordic nRF52 M4
	Nordic nRF52 Access Port 

attaching to target successful.
downloading... total size: 1.2M
downloading section [.text] (8.4K)
100%|###################################################################################################################################################################|
downloading section [.ARM.exidx] (8B)
100%|###################################################################################################################################################################|
downloading section [.eh_frame] (80B)
100%|###################################################################################################################################################################|
downloading section [.relocate] (100B)
100%|###################################################################################################################################################################|
downloading finished
checking successful
killing successful.
- |#                                                                                                                                            | 0 Elapsed Time: 0:00:00

Issues/PRs references

Fixes: #20604

[riot-ci]

Murdock results

✔️ PASSED

c56f50a dist/tools/bmp: fix target parsing

Success	Failures	Total	Runtime
1	0	1	01m:08s

Artifacts

• Documentation preview

[maribu]

Thx :)