bump go version (#49)

#### 📖 Summary

- update go version download

#### 📑 Test Plan

> 💡 Select your test plan for the code changes.

- [x] CI pipeline tests
- [ ] Custom test
- [ ] No test plan

##### Details / Justification

<!-- Add your test details or justification for missing tests here. -->

#### 📚 Additional Notes

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Co-authored-by: OCram85 <marco.blessing@googlemail.com>
Reviewed-on: #49

arkanum

@@ -73,7 +73,7 @@ function instDotNet() {
 
 function instGoLang() {
   if [[ -z "$1" ]]; then
-    GOVERSION="1.19.3"
+    GOVERSION="1.20.6"
   else
     GOVERSION="$1"
   fi