mod: bump zterm dependency; add zlog dependency

`zlog` is used to log messages to the log file that is also used by
`serve` by default, making it a single source for all the log messages.

build.zig

@@ -4,6 +4,14 @@ pub fn build(b: *std.Build) void {
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
 
+    const zlog = b.dependency("zlog", .{
+        .target = target,
+        .optimize = optimize,
+        .timestamp = false,
+        .stderr = false,
+        .file = "log",
+    });
+
     const zterm = b.dependency("zterm", .{
         .target = target,
         .optimize = optimize,
@@ -17,6 +25,7 @@ pub fn build(b: *std.Build) void {
             .optimize = optimize,
             .imports = &.{
                 .{ .name = "zterm", .module = zterm.module("zterm") },
+                .{ .name = "zlog", .module = zlog.module("zlog") },
                 .{
                     .name = "about",
                     .module = b.createModule(.{

build.zig.zon

@@ -6,8 +6,12 @@
     .minimum_zig_version = "0.16.0-dev.463+f624191f9",
     .dependencies = .{
         .zterm = .{
-            .url = "git+https://gitea.yves-biener.de/yves-biener/zterm#89aeac1e968f1390bd945f734aac8612efbab179",
-            .hash = "zterm-0.3.0-1xmmELjzGwBxVlqXRHn7p-sXFU9xPxqFMxF0PY2CkzFn",
+            .url = "git+https://gitea.yves-biener.de/yves-biener/zterm#c645c2efee5ff57fa6fb2b9f9155cf21723bf085",
+            .hash = "zterm-0.3.0-1xmmEMbzGwD3MiXzgXWwnTEFIjvtWTcQrBLqYS5O00ee",
+        },
+        .zlog = .{
+            .url = "git+https://gitea.yves-biener.de/yves-biener/zlog#411a6dc358a3ef463ab704e2f6b887a019a5decf",
+            .hash = "zlog-0.15.0-6JSlR9tGAAD1_RAwOEDWrSVFRl4t4WFsJxRXqrW1PHfK",
         },
     },
     .paths = .{

src/main.zig

@@ -118,10 +118,12 @@ pub fn main() !void {
 }
 
 pub const panic = App.panic_handler;
+pub const std_options = zlog.std_options;
 const log = std.log.scoped(.default);
 
 const std = @import("std");
 const assert = std.debug.assert;
+const zlog = @import("zlog");
 const zterm = @import("zterm");
 const App = zterm.App(
     Model,