ci: setup semantic-release for v2 deployments

To continue supporting v2 of our SDK, this commit configures the semantic-release deployment tool to create 2.x deployments when we make new merges into v2 branch.

.github/workflows/deploy-sdk.yml

@@ -9,7 +9,7 @@ on:
         type: string
 
   push:
-    branches: [beta, main, v1] # all branches where deployments currently occur. Make sure this list matches list of branches in  `.releaserc` file.
+    branches: [beta, main, v1, v2] # all branches where deployments currently occur. Make sure this list matches list of branches in  `.releaserc` file.
 
 permissions:
   contents: write # access to push the git tag

.releaserc.json

@@ -2,6 +2,7 @@
     "tagFormat": "${version}",
     "branches": [
         "main",
+        { "name": "v2", "range": "2.x" },
         { "name": "beta", "prerelease": true },
         { "name": "alpha", "prerelease": true }
     ],