Improve test stability (#310)

* Improve stability of network/wlan tests

* Improve stability of user tests

* Don't test with different Terraform versions

.github/workflows/acctest.yml

@@ -25,9 +25,6 @@ jobs:
           - "v7.3"
           - "v7"
           - "latest"
-        terraform_version:
-          - "1.2.9"
-          - "1.3.9"
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v3
@@ -40,6 +37,6 @@ jobs:
 
       - name: TF acceptance tests
         timeout-minutes: 10
-        run: make testacc TF_ACC_TERRAFORM_VERSION=${{ matrix.terraform_version }}
+        run: make testacc
 
       - run: make testacc-down