…ource

```console
% go test -count=1 ./internal/framework/validators/...
ok      github.com/hashicorp/terraform-provider-aws/internal/framework/validators       0.492s
```

…ecated

This change returns a data structure more closely matching the `DescribeRuntimeVersions` API result. It also removes the `skip_deprecated` argument, as the ability to use the `latest` argument on the `aws_synthetics_runtime_version` data source eliminates much of the need to exclude deprecated versions from the result set.

```console
% make testacc PKG=synthetics TESTS=TestAccSyntheticsRuntimeVersion
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.22.6 test ./internal/service/synthetics/... -v -count 1 -parallel 20 -run='TestAccSyntheticsRuntimeVersion'  -timeout 360m

--- PASS: TestAccSyntheticsRuntimeVersionsDataSource_basic (10.21s)
--- PASS: TestAccSyntheticsRuntimeVersionDataSource_deprecatedVersion (10.21s)
--- PASS: TestAccSyntheticsRuntimeVersionDataSource_basic (10.25s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/synthetics 16.489s
```

This eliminates the dependency on hardcoded runtime versions which become deprecated over time and can cause test failures.

```console
% make testacc PKG=synthetics TESTS=TestAccSyntheticsCanary_
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.22.6 test ./internal/service/synthetics/... -v -count 1 -parallel 20 -run='TestAccSyntheticsCanary_'  -timeout 360m

--- PASS: TestAccSyntheticsCanary_tags (94.55s)
--- PASS: TestAccSyntheticsCanary_runtimeVersion (129.64s)
--- PASS: TestAccSyntheticsCanary_runTracing (144.68s)
--- PASS: TestAccSyntheticsCanary_startCanary (194.92s)
--- PASS: TestAccSyntheticsCanary_run (216.00s)
--- PASS: TestAccSyntheticsCanary_runEnvironmentVariables (219.09s)
--- PASS: TestAccSyntheticsCanary_artifactEncryption (237.15s)
--- PASS: TestAccSyntheticsCanary_disappears (470.10s)
--- PASS: TestAccSyntheticsCanary_s3 (559.86s)
--- PASS: TestAccSyntheticsCanary_StartCanary_codeChanges (586.04s)
--- PASS: TestAccSyntheticsCanary_basic (606.08s)
--- PASS: TestAccSyntheticsCanary_rate (678.13s)
--- PASS: TestAccSyntheticsCanary_vpc (2180.95s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/synthetics 2187.415s
```