pkg/apk: don't log requests

[imjasonh]

hashi's retryablehttp debug-logs every request, which is noisy and incompatible with log/slog (hashicorp/go-retryablehttp#211), so let's just make it totally quiet until we can make it debug-quiet.

Before

go test ./pkg/apk -v -run=Test_getApkPackages
=== RUN   Test_getApkPackages
2025/01/08 09:20:59 [DEBUG] GET http://127.0.0.1:58527/APKINDEX.tar.gz
2025/01/08 09:20:59 found 2 latest apk index package versions
--- PASS: Test_getApkPackages (0.00s)
PASS
ok      github.com/wolfi-dev/wolfictl/pkg/apk   0.306s

After

go test ./pkg/apk -v -run=Test_getApkPackages
=== RUN   Test_getApkPackages
2025/01/08 09:20:52 found 2 latest apk index package versions
--- PASS: Test_getApkPackages (0.00s)
PASS
ok      github.com/wolfi-dev/wolfictl/pkg/apk   0.327s

[luhring]

Yes thank you thank you — this has been annoying <3