[release] Prepare and release 1.2.0-M5

Signed-off-by: Dariusz Jędrzejczyk <dariusz.jedrzejczyk@broadcom.com>

Author: chemicL

gradle.properties

@@ -1,2 +1,2 @@
-version=1.2.0-SNAPSHOT
-reactorPoolMicrometerVersion=0.3.0-SNAPSHOT
+version=1.2.0-M5
+reactorPoolMicrometerVersion=0.3.0-M5

gradle/libs.versions.toml

@@ -1,8 +1,8 @@
 [versions]
 # Baselines, should be updated on every release
 baseline-pool-api = "1.1.3"
-reactorCore = "3.8.0-SNAPSHOT"
-reactorAddons = "3.5.3-SNAPSHOT"
+reactorCore = "3.8.0-M5"
+reactorAddons = "3.6.0-RC3"
 
 # Other shared versions
 junit = "5.13.3"