remove unused gpg ssh program configuration and update flake.lock dependencies

config/gitconfig.linux

@@ -6,9 +6,6 @@
 [gpg]
   format = ssh
 
-[gpg "ssh"]
-  program = "op-ssh-sign"
-
 [commit]
   gpgsign = true
   

config/home-manager/flake.lock

@@ -42,11 +42,11 @@
         "zig": "zig"
       },
       "locked": {
-        "lastModified": 1735765328,
-        "narHash": "sha256-f4LI34cXP8nOTi4Va6GPUFaJYf0qGbabk+OeUddsfuk=",
+        "lastModified": 1736402835,
+        "narHash": "sha256-SiG2B2KfU4BIOggrJJa9nKoagXtLXWWo9vXJ88a+ls8=",
         "owner": "ghostty-org",
         "repo": "ghostty",
-        "rev": "94599102e9fb8247af08cbbbcb7ee25e3d31e1bd",
+        "rev": "2d7706ec4f7042b9072d3b8ac8ea496dee209bc8",
         "type": "github"
       },
       "original": {
@@ -62,11 +62,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1735344290,
-        "narHash": "sha256-oJDtWPH1oJT34RJK1FSWjwX4qcGOBRkcNQPD0EbSfNM=",
+        "lastModified": 1736373539,
+        "narHash": "sha256-dinzAqCjenWDxuy+MqUQq0I4zUSfaCvN9rzuCmgMZJY=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "613691f285dad87694c2ba1c9e6298d04736292d",
+        "rev": "bd65bc3cde04c16755955630b344bc9e35272c56",
         "type": "github"
       },
       "original": {
@@ -78,11 +78,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1735669367,
-        "narHash": "sha256-tfYRbFhMOnYaM4ippqqid3BaLOXoFNdImrfBfCp4zn0=",
+        "lastModified": 1736200483,
+        "narHash": "sha256-JO+lFN2HsCwSLMUWXHeOad6QUxOuwe9UOAF/iSl1J4I=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "edf04b75c13c2ac0e54df5ec5c543e300f76f1c9",
+        "rev": "3f0a8ac25fb674611b98089ca3a5dd6480175751",
         "type": "github"
       },
       "original": {
@@ -126,11 +126,11 @@
     },
     "nixpkgs-unstable_2": {
       "locked": {
-        "lastModified": 1735471104,
-        "narHash": "sha256-0q9NGQySwDQc7RhAV2ukfnu7Gxa5/ybJ2ANT8DQrQrs=",
+        "lastModified": 1736344531,
+        "narHash": "sha256-8YVQ9ZbSfuUk2bUf2KRj60NRraLPKPS0Q4QFTbc+c2c=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "88195a94f390381c6afcdaa933c2f6ff93959cb4",
+        "rev": "bffc22eb12172e6db3c5dde9e3e5628f8e3e7912",
         "type": "github"
       },
       "original": {