Merge branch 'v1-3-release' into 'develop'

doc(release): prepare release notes for 2021-Q4 release (v1.3)

See merge request oai/cn5g/oai-cn5g-upf-vpp!16

CHANGELOG.md

 # RELEASE NOTES: #
 
+## v1.3.0 -- January 2022 ##
+
+* Upgrade to UPG plugin stable/1.2
+* Build fixes
+* Deployment fixes (wait launch of NRF Client until VPP is getting ready)
+
 ## v1.2.1 -- October 2021 ##
 
 * Initial Public Release