Bump Expected Minimum Go Version to 1.17

[bflad]

Reference: #933

Previously from tenv linter:

helper/schema/schema_test.go:29:2: os.Setenv() can be replaced by `t.Setenv()` in TestEnvDefaultFunc (tenv)
        if err := os.Setenv(key, "foo"); err != nil {
        ^
helper/schema/schema_test.go:67:2: os.Setenv() can be replaced by `t.Setenv()` in TestMultiEnvDefaultFunc (tenv)
        if err := os.Setenv(keys[0], "foo"); err != nil {
        ^
helper/schema/schema_test.go:85:2: os.Setenv() can be replaced by `t.Setenv()` in TestMultiEnvDefaultFunc (tenv)
        if err := os.Setenv(keys[1], "foo"); err != nil {
        ^
helper/schema/schema_test.go:8479:2: os.Setenv() can be replaced by `t.Setenv()` in TestPanicOnErrorDefaultsFalse (tenv)
        os.Setenv("TF_ACC", "")
        ^
helper/schema/schema_test.go:8484:2: os.Setenv() can be replaced by `t.Setenv()` in TestPanicOnErrorDefaultsFalse (tenv)
        os.Setenv("TF_ACC", oldEnv)
        ^
helper/schema/schema_test.go:8490:2: os.Setenv() can be replaced by `t.Setenv()` in TestPanicOnErrorTF_ACCSet (tenv)
        os.Setenv("TF_ACC", "1")
        ^
helper/schema/schema_test.go:8495:2: os.Setenv() can be replaced by `t.Setenv()` in TestPanicOnErrorTF_ACCSet (tenv)
        os.Setenv("TF_ACC", oldEnv)
        ^

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