gnu: Introduce versioned 'openssl-1.1' variable.

...and use it in packages that do not yet support 3.0.

* gnu/packages/tls.scm (openssl): Rename to ...
(openssl-1.1): ... this.
(openssl/fixed): Inherit from OPENSSL-1.1.
(openssl-3.0): Likewise.
(openssl): Turn into alias for OPENSSL-1.1.
* gnu/packages/ruby.scm (ruby-2.6)[inputs]: Change from OPENSSL to OPENSSL-1.1.
(ruby-3.0)[inputs]: Change "openssl" input to OPENSSL.
(ruby-3.1): Inherit from RUBY-3.0.
* gnu/packages/python.scm (python-2.7)[inputs]: Change from OPENSSL to
OPENSSL-1.1.
(python-3.9)[inputs]: Replace "openssl" with OPENSSL.
* gnu/packages/python-crypto.scm (python-cryptography)[inputs]: Change from
OPENSSL to OPENSSL-1.1.
* gnu/packages/databases.scm (mariadb)[inputs]: Likewise.
* gnu/packages/node.scm (node)[native-inputs, inputs]: Likewise.
(node-lts)[native-inputs]: Likewise.

gnu/packages/python.scm

@@ -388,7 +388,7 @@
            gdbm
            libffi ; for ctypes
            sqlite ; for sqlite extension
-           openssl
+           openssl-1.1
            readline
            zlib
            tcl
@@ -556,6 +556,9 @@ data types.")
                            (map cdr outputs)))))
            (replace 'install-sitecustomize.py
              ,(customize-site version))))))
+    (inputs
+     (modify-inputs (package-inputs python-2.7)
+       (replace "openssl" openssl)))
     (native-inputs
      `(("tzdata" ,tzdata-for-tests)
        ("unzip" ,unzip)