bump min go version to 1.21

Author: crimist

.github/workflows/go.yml

@@ -10,7 +10,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v3
         with:
-          go-version: '1.20.x'
+          go-version: '1.21.x'
           cache: true
 
       - name: Build

README.md

@@ -28,7 +28,7 @@ Try Trakx for yourself! These instances are hosted on Oracles always free tier.
 
 ## 🚀 Install
 
-Go 1.20+ required.
+Go 1.21+ required.
 
 ```sh
 git clone https://github.com/crimist/trakx && cd trakx