Bump version to 2.28.5

```
./scripts/bump_version.sh --version 2.28.5
```

Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
diff --git a/include/mbedtls/version.h b/include/mbedtls/version.h
index b602eca..4fe37c2 100644
--- a/include/mbedtls/version.h
+++ b/include/mbedtls/version.h
@@ -38,16 +38,16 @@
  */
 #define MBEDTLS_VERSION_MAJOR  2
 #define MBEDTLS_VERSION_MINOR  28
-#define MBEDTLS_VERSION_PATCH  4
+#define MBEDTLS_VERSION_PATCH  5
 
 /**
  * The single version number has the following structure:
  *    MMNNPP00
  *    Major version | Minor version | Patch version
  */
-#define MBEDTLS_VERSION_NUMBER         0x021C0400
-#define MBEDTLS_VERSION_STRING         "2.28.4"
-#define MBEDTLS_VERSION_STRING_FULL    "Mbed TLS 2.28.4"
+#define MBEDTLS_VERSION_NUMBER         0x021C0500
+#define MBEDTLS_VERSION_STRING         "2.28.5"
+#define MBEDTLS_VERSION_STRING_FULL    "Mbed TLS 2.28.5"
 
 #if defined(MBEDTLS_VERSION_C)