[chore] Release 1.12.0 (#179)

Author: hiranya911

.github/workflows/release.yml

@@ -135,7 +135,7 @@ jobs:
       uses: firebase/firebase-admin-node/.github/actions/send-tweet@master
       with:
         status: >
-          ${{ steps.preflight.outputs.version }} of @Firebase Admin .NET SDK is avaialble.
+          ${{ steps.preflight.outputs.version }} of @Firebase Admin .NET SDK is available.
           https://github.com/firebase/firebase-admin-dotnet/releases/tag/${{ steps.preflight.outputs.version }}
         consumer-key: ${{ secrets.TWITTER_CONSUMER_KEY }}
         consumer-secret: ${{ secrets.TWITTER_CONSUMER_SECRET }}

FirebaseAdmin/FirebaseAdmin/FirebaseAdmin.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <Version>1.11.0</Version>
+    <Version>1.12.0</Version>
     <TargetFrameworks>netstandard1.5;netstandard2.0;net45</TargetFrameworks>
     <TargetFrameworks Condition=" '$(OS)' != 'Windows_NT' ">netstandard1.5;netstandard2.0</TargetFrameworks>
     <LangVersion>latest</LangVersion>