nerves_system_br: bump to v1.14.5

[fhunleth]

No description provided.

[ConnorRigby]

CI failed with:

/bin/bash: fork: retry: Resource temporarily unavailable
make[5]: fork: Resource temporarily unavailable
make[5]: fork: Resource temporarily unavailable
  CC       filenamecat.o
/bin/bash: fork: retry: Resource temporarily unavailable
  CC       freading.o
/bin/bash: fork: retry: Resource temporarily unavailable
  CC       fopen-safer.o
/bin/bash: fork: retry: Resource temporarily unavailable
  CC       filenamecat-lgpl.o
/bin/bash: fork: retry: Resource temporarily unavailable
Makefile:1674: recipe for target 'all' failed
make[4]: *** [all] Error 2
Makefile:1572: recipe for target 'all-recursive' failed
make[3]: *** [all-recursive] Error 1
Makefile:1528: recipe for target 'all' failed
make[2]: *** [all] Error 2
package/pkg-generic.mk:247: recipe for target '/root/project/.nerves/artifacts/nerves_system_rpi3a-portable-1.14.0/build/host-m4-1.4.18/.stamp_built' failed
make[1]: *** [/root/project/.nerves/artifacts/nerves_system_rpi3a-portable-1.14.0/build/host-m4-1.4.18/.stamp_built] Error 2
Makefile:23: recipe for target '_all' failed
make: *** [_all] Error 2

Willing to bet a restart will fix it