Prepare for 1.1.1k release

Reviewed-by: NTomas Mraz <tomas@openssl.org>

CHANGES

@@ -7,7 +7,7 @@
  https://github.com/openssl/openssl/commits/ and pick the appropriate
  release branch.
 
- Changes between 1.1.1j and 1.1.1k [xx XXX xxxx]
+ Changes between 1.1.1j and 1.1.1k [25 Mar 2021]
 
   *) Fixed a problem with verifying a certificate chain when using the
      X509_V_FLAG_X509_STRICT flag. This flag enables additional security checks

NEWS

@@ -5,7 +5,7 @@
   This file gives a brief overview of the major changes between each OpenSSL
   release. For more details please read the CHANGES file.
 
-  Major changes between OpenSSL 1.1.1j and OpenSSL 1.1.1k [under development]
+  Major changes between OpenSSL 1.1.1j and OpenSSL 1.1.1k [25 Mar 2021]
 
       o Fixed a problem with verifying a certificate chain when using the
         X509_V_FLAG_X509_STRICT flag (CVE-2021-3450)

README

 
- OpenSSL 1.1.1k-dev
+ OpenSSL 1.1.1k 25 Mar 2021
 
  Copyright (c) 1998-2021 The OpenSSL Project
  Copyright (c) 1995-1998 Eric A. Young, Tim J. Hudson

include/openssl/opensslv.h

@@ -39,8 +39,8 @@ extern "C" {
  * (Prior to 0.9.5a beta1, a different scheme was used: MMNNFFRBB for
  *  major minor fix final patch/beta)
  */
-# define OPENSSL_VERSION_NUMBER  0x101010b0L
-# define OPENSSL_VERSION_TEXT    "OpenSSL 1.1.1k-dev  xx XXX xxxx"
+# define OPENSSL_VERSION_NUMBER  0x101010bfL
+# define OPENSSL_VERSION_TEXT    "OpenSSL 1.1.1k  25 Mar 2021"
 
 /*-
  * The macros below are to be used for shared library (.so, .dll, ...)