Backport Master CI PRs to Beta (#7890)

* Resolve conflicts

* Resolve conflicts

* Update gitlab-build.sh (#7855)

fix build ```version``` after https://github.com/paritytech/parity/pull/7723

* Resolve conflicts

* Update gitlab-test.sh (#7883)

* Update gitlab-test.sh

https://github.com/paritytech/parity/issues/7871

* Update aura-test.sh

* Backport master ci prs

* Bump beta to 1.9.3

* Make track beta

* Downgrade rustc_version

mac/Parity.pkgproj

@@ -462,7 +462,7 @@
 				<key>OVERWRITE_PERMISSIONS</key>
 				<false/>
 				<key>VERSION</key>
-				<string>1.9.2</string>
+				<string>1.9.3</string>
 			</dict>
 			<key>UUID</key>
 			<string>2DCD5B81-7BAF-4DA1-9251-6274B089FD36</string>