Update grsecurity kernels to 4.14.175

Closes #5111

Author: Conor Schaefer

install_files/ansible-base/group_vars/all/securedrop

@@ -40,5 +40,5 @@ securedrop_cond_reboot_file: /tmp/sd-reboot-now
 
 # If you bump this, also remember to bump in molecule/builder/tests/vars.yml
 securedrop_pkg_grsec:
-  ver: "4.14.154"
+  ver: "4.14.175"
   depends: "linux-image-4.14.154-grsec-securedrop,linux-image-4.4.182-grsec,linux-firmware-image-4.4.182-grsec,intel-microcode"

molecule/builder-xenial/tests/vars.yml

@@ -3,7 +3,7 @@ securedrop_version: "1.3.0~rc1"
 ossec_version: "3.0.0"
 keyring_version: "0.1.3"
 config_version: "0.1.3"
-grsec_version: "4.14.154"
+grsec_version: "4.14.175"
 
 # These values will be interpolated with values populated above
 # via helper functions in the tests.

molecule/testinfra/staging/vars/staging.yml

@@ -195,4 +195,4 @@ log_events_with_ossec_alerts:
     rule_id: "400700"
 
 fpf_apt_repo_url: "https://apt-test.freedom.press"
-grsec_version: "4.14.154"
+grsec_version: "4.14.175"