Remove testscript conditionals for Go versions < 1.24

Since we're now supporting Go 1.24+, there's no need to maintain
the exclusion of some test cases using `[go1.24]`, so those were
removed.

Author: hslatman

integration/testdata/crypto/jwk-create-rsa.txtar

@@ -53,9 +53,9 @@ check_jwk rsa-2048-ps512.pub rsa-2048-ps512.priv RSA 2048 PS512
 stderr 'flag ''--size'' requires at least 2048 unless ''--insecure'' flag is provided'
 
 
-# RSA 1024, PS256 with insecure flag; skipped on Go < 1.24, because small keys were supported on those
-[go1.24] ! exec step crypto jwk create --password-file password.txt --kty RSA --size 1024 --alg PS256 rsa-1024-ps256.pub rsa-1024-ps256.priv --insecure
-[go1.24] stderr 'the size of the RSA key should be at least 2048 bits'
+# RSA 1024, PS256 with insecure flag
+! exec step crypto jwk create --password-file password.txt --kty RSA --size 1024 --alg PS256 rsa-1024-ps256.pub rsa-1024-ps256.priv --insecure
+stderr 'the size of the RSA key should be at least 2048 bits'
 
 
 # RSA 0, PS256

integration/testdata/crypto/keypair.txtar

@@ -67,9 +67,9 @@ stderr 'flag ''--size'' requires at least 2048 unless ''--insecure'' flag is pro
 stderr 'flag ''--size'' must be greater than or equal to 0'
 
 
-# RSA size 16 with insecure flag; skipped on Go < 1.24, because small keys were supported on those
-[go1.24] ! exec step crypto keypair --password-file password.txt --kty RSA --size 16 --insecure rsa-error.pub rsa-error.priv
-[go1.24] stderr 'error generating RSA key: crypto/rsa: 16-bit keys are insecure'
+# RSA size 16 with insecure flag
+! exec step crypto keypair --password-file password.txt --kty RSA --size 16 --insecure rsa-error.pub rsa-error.priv
+stderr 'error generating RSA key: crypto/rsa: 16-bit keys are insecure'
 
 
 # RSA size 1024 without insecure flag