Bump format/signature dependencies to prereleases

This makes it possible to use `rsa` with prerelease versions of
`x509-cert`.

Bumps the following dependencies:

- `const-oid` v0.10.0-pre.2
- `digest` v0.11.0-pre.7
- `pkcs1` v0.8.0-pre.0
- `pkcs8` v0.11.0-pre.0
- `signature` v2.3.0-pre.2
- `sha1` v0.11.0-pre.2
- `sha2` v0.11.0-pre.2
- `sha3` v0.11.0-pre.2
- `spki` v0.8.0-pre.0

Cargo.toml

@@ -17,18 +17,18 @@ num-bigint = { version = "0.8.2", features = ["i128", "prime", "zeroize"], defau
 num-traits = { version= "0.2.9", default-features = false, features = ["libm"] }
 num-integer = { version = "0.1.39", default-features = false }
 rand_core = { version = "0.6.4", default-features = false }
-const-oid = { version = "0.9", default-features = false }
+const-oid = { version = "=0.10.0-pre.2", default-features = false }
 subtle = { version = "2.1.1", default-features = false }
-digest = { version = "0.10.5", default-features = false, features = ["alloc", "oid"] }
-pkcs1 = { version = "0.7.5", default-features = false, features = ["alloc", "pkcs8"] }
-pkcs8 = { version = "0.10.2", default-features = false, features = ["alloc"] }
-signature = { version = ">2.0, <2.3", default-features = false , features = ["alloc", "digest", "rand_core"] }
-spki = { version = "0.7.3", default-features = false, features = ["alloc"] }
+digest = { version = "=0.11.0-pre.7", default-features = false, features = ["alloc", "oid"] }
+pkcs1 = { version = "=0.8.0-pre.0", default-features = false, features = ["alloc", "pkcs8"] }
+pkcs8 = { version = "=0.11.0-pre.0", default-features = false, features = ["alloc"] }
+signature = { version = "=2.3.0-pre.2", default-features = false , features = ["alloc", "digest", "rand_core"] }
+spki = { version = "=0.8.0-pre.0", default-features = false, features = ["alloc"] }
 zeroize = { version = "1.5", features = ["alloc"] }
 
 # optional dependencies
-sha1 = { version = "0.10.5", optional = true, default-features = false, features = ["oid"] }
-sha2 = { version = "0.10.6", optional = true, default-features = false, features = ["oid"] }
+sha1 = { version = "=0.11.0-pre.2", optional = true, default-features = false, features = ["oid"] }
+sha2 = { version = "=0.11.0-pre.2", optional = true, default-features = false, features = ["oid"] }
 serde = { version = "1.0.184", optional = true, default-features = false, features = ["derive"] }
 
 [dev-dependencies]
@@ -40,9 +40,9 @@ rand_xorshift = "0.3"
 rand_chacha = "0.3"
 rand = "0.8"
 rand_core = { version = "0.6", default-features = false }
-sha1 = { version = "0.10.5", default-features = false, features = ["oid"] }
-sha2 = { version = "0.10.6", default-features = false, features = ["oid"] }
-sha3 = { version = "0.10.7", default-features = false, features = ["oid"] }
+sha1 = { version = "=0.11.0-pre.2", default-features = false, features = ["oid"] }
+sha2 = { version = "=0.11.0-pre.2", default-features = false, features = ["oid"] }
+sha3 = { version = "=0.11.0-pre.2", default-features = false, features = ["oid"] }
 
 [[bench]]
 name = "key"