[23.05] openwisp-monitoring: align PKG_SOURCE_VERSION with PKG_VERSION #20823

Job	Run time
Feeds Package Test Build / Test aarch64_generic	5m 4s
Feeds Package Test Build / Test arm_cortex-a15_neon-vfpv4	5m 1s
Feeds Package Test Build / Test arm_cortex-a9_vfpv3-d16	4m 58s
Feeds Package Test Build / Test i386_pentium-mmx	5m 2s
Feeds Package Test Build / Test mips_24kc	5m 47s
Feeds Package Test Build / Test mipsel_24kc	4m 41s
Feeds Package Test Build / Test powerpc_464fp	5m 33s
Feeds Package Test Build / Test powerpc_8548	5m 5s
Feeds Package Test Build / Test riscv64_riscv64	5m 2s
Feeds Package Test Build / Test x86_64	4m 45s
	50m 58s

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