refactor(build): Bump version to v1.3.15 #1584

Job	Run time
Debug Build & Unit Tests (gcc)	2m 9s
Debug Build & Unit Tests without Subscriptions (gcc)	45s
Debug Build & Unit Tests with Diagnostics (gcc)	2m 1s
Debug Build & Unit Tests with multithreading (gcc)	1m 28s
Debug Build & Unit Tests with Alarms&Conditions (gcc)	3m 12s
Debug Build & Unit Tests (clang)	2m 36s
Debug Build & Unit Tests (tcc)	1m 37s
Encryption (MbedTLS) Build & Unit Tests (gcc)	1m 20s
PubSub Encryption (MbedTLS) Build & Unit Tests (gcc)	1m 43s
Encryption (OpenSSL) Build & Unit Tests (gcc)	1m 26s
Encryption (LibreSSL) Build & Unit Tests (gcc)	4m 32s
TPM Tool Build	2m 29s
Release Build	46s
Amalgamation Build	35s
Amalgamation Build with Multithreading	39s
Valgrind Unit Tests with MbedTLS (gcc)	4m 56s
Valgrind Unit Tests with OpenSSL (gcc)	5m 20s
Valgrind Examples with MbedTLS (gcc)	11m 4s
Valgrind Examples with OpenSSL (gcc)	11m 9s
Clang Static Analyzer	2m 27s
	1h 2m 14s

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