Merge branch 'jk/httpd-test-updates'

Test update.

* jk/httpd-test-updates:
  t/lib-httpd: increase ssl key size to 2048 bits
  t/lib-httpd: drop SSLMutex config
  t/lib-httpd: bump required apache version to 2.4
  t/lib-httpd: bump required apache version to 2.2

This is a backport onto the `maint-2.39` branch, to improve the CI
health of that branch.

Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>

diff --cc t/lib-httpd.sh
Simple merge

diff --cc t/lib-httpd/apache.conf
index 6d5d66caf811c5fd6ad383728faf4c739cdc5346,51a4fbcf621a4bf023522747e1a1569ecf30edc4..693b75e0ae8fb5a6d438c0d4fb565703ea0333d8
--- 1/t/lib-httpd/apache.conf
--- 2/t/lib-httpd/apache.conf
+++ b/t/lib-httpd/apache.conf
@@@ -31,20 -31,9 +31,9 @@@ ErrorLog error.lo
  
  <IfDefine HTTP2>
  LoadModule http2_module modules/mod_http2.so
 -Protocols h2c
 +Protocols h2 h2c
  </IfDefine>
  
- <IfVersion < 2.4>
- LockFile accept.lock
- </IfVersion>
- 
- <IfVersion < 2.1>
- <IfModule !mod_auth.c>
-       LoadModule auth_module modules/mod_auth.so
- </IfModule>
- </IfVersion>
- 
- <IfVersion >= 2.1>
  <IfModule !mod_auth_basic.c>
        LoadModule auth_basic_module modules/mod_auth_basic.so
  </IfModule>