test(rtc): Write the crypto tests' remaining literal IVs and nonces as hex
Three values of the AWS-LC provider's tests were literal arrays, which
CodeQL reports as hard-coded IVs and nonces (alerts 379 to 381): the
all-zero-then-all-ones counter of the 128-bit carry test, the filler
nonce of the CCM state test, and the 13-byte nonce it expects refused.
The first two are hex strings like every other vector in the file; the
refused nonce is the vector's own nonce with one byte more.
cargo test -p selkies-rtc: 334 passed.