Add fingerprint for Singapore

[sitinurliza95]

Blockpage https://explorer.ooni.org/m/20240612234714.158338_SG_webconnectivity_c662617fd1c3786a

http://103.7.201.57/

[sitinurliza95]

https://explorer.ooni.org/m/20240612234714.158338_SG_webconnectivity_c662617fd1c3786a

http://13.248.218.86/

[sitinurliza95]

https://explorer.ooni.org/m/20240512164758.666728_SG_webconnectivity_e3507be72010b4d0

https://76.223.74.109/

[sitinurliza95]

I've added them here #17