Update release version to 1.15.0 in charts (#2267)

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

charts/fission-all/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v2
 name: fission-all
-version: v1.15.0-rc2
-appVersion: v1.15.0-rc2
+version: v1.15.0
+appVersion: v1.15.0
 description: Fission is a fast serverless framework for Kubernetes.
 home: https://fission.io/
 icon: https://fission.io/images/fission-logo-white.svg

charts/fission-all/values.yaml

@@ -25,7 +25,7 @@ image: fission/fission-bundle
 ## It is also used by the chart to identify version of the few more images apart from fission-bundle.
 ## Keep it empty for using latest tag.
 ##
-imageTag: v1.15.0-rc2
+imageTag: v1.15.0
 
 ## pullPolicy represents the pull policy to use for images in the chart.
 ##
@@ -85,7 +85,7 @@ fetcher:
   ## image represents the image of the fetcher component.
   image: fission/fetcher
   ## imageTag represents the tag of the image of the fetcher component.
-  imageTag: v1.15.0-rc2
+  imageTag: v1.15.0
 
   ## Fetcher is only for to downloading or uploading archive.
   ## Normally, you don't need to change the value here, unless necessary.
@@ -451,7 +451,7 @@ preUpgradeChecks:
   image: fission/pre-upgrade-checks
   ## pre-install/pre-upgrade checks image version
   ##
-  imageTag: v1.15.0-rc2
+  imageTag: v1.15.0
 
 ## Fission post-install/post-upgrade reporting live in this image
 ##