Bump version to Mbed TLS 2.23.0

Executed "./scripts/bump_version.sh --version 2.23.0 --so-crypto 5"

A symbol has been removed from the mbedcrypto library since the last
release:
mbedtls_ecc_group_to_psa ( enum mbedtls_ecp_group_id grpid,
                           size_t* bits )

This is an ABI break and we need to increase the SO version.

Signed-off-by: Janos Follath <janos.follath@arm.com>
diff --git a/library/Makefile b/library/Makefile
index dbdd3b6..87ea56d 100644
--- a/library/Makefile
+++ b/library/Makefile
@@ -37,7 +37,7 @@
 
 SOEXT_TLS=so.13
 SOEXT_X509=so.1
-SOEXT_CRYPTO=so.4
+SOEXT_CRYPTO=so.5
 
 # Set AR_DASH= (empty string) to use an ar implementation that does not accept
 # the - prefix for command line options (e.g. llvm-ar)