Minor fix to ensure Python 3 support in the debugger #23

Job	Run time
ASAN_Tests_Debug	3m 34s
Checks	5m 20s
ASAN_Tests	3m 37s
Clang_Unit_Build_Option_Tests	4m 23s
Conformance_Tests_ESNext	2m 13s
Conformance_Tests_ESNext_Debug_A	2m 8s
Conformance_Tests_ESNext_Debug_B	1m 25s
ESP_IDF_Build_Test	3m 38s
ESP8266_RTOS_SDK_Build_Test	1m 33s
Linux_AArch64_Tests	4m 39s
Linux_AArch64_Tests_Debug	6m 33s
Linux_ARMv7l_Tests	4m 19s
Linux_ARMv7l_Tests_Debug	6m 15s
Linux_x86_cpointer-32bit_Build_Correctness_Tests	1m 43s
Linux_x86-64_Build_Correctness_Debugger_Tests	4m 59s
Linux_x86-64_Build_Option_Tests	4m 20s
MbedOS_K64F_Build_Test	1m 32s
Notification	0s
NuttX_STM32F4_Build_Test	2m 18s
OSX_x86-64_Build_Correctness_Unit_Tests	3m 7s
OSX_x86-64_Build_Correctness_Unit_Tests_Debug	3m 16s
RIOT_STM32F4_Build_Test	1m 38s
UBSAN_Tests	2m 14s
Unit_Tests	1m 48s
Zephyr_STM32F4_Build_Test	3m 33s
	1h 20m 5s

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