chore(go): update go test matrix and clean up setup (#788)

Author: rishav-karanjit

.github/actions/install_smithy_dafny_codegen_dependencies/action.yml

@@ -30,16 +30,6 @@ runs:
         python -m pip install --upgrade black
         python -m pip install --upgrade docformatter
 
-    - name: Install Go
-      uses: actions/setup-go@v5
-      with:
-        go-version: "1.23"
-
-    - name: Install Go imports
-      shell: bash
-      run: |
-        go install golang.org/x/tools/cmd/goimports@latest
-
     # Without this the if-dafny-at-least command includes "Downloading ..." output
     - name: Arbitrary makefile target to force downloading Gradle
       shell: bash

.github/workflows/library_go_tests.yml

@@ -20,7 +20,7 @@ jobs:
       fail-fast: false
       matrix:
         library: [AwsEncryptionSDK, TestVectors]
-        go-version: ["1.23"]
+        go-version: ["1.23", "1.24"]
         os: [
             # Sed script doesn't work properly on windows
             # windows-latest,