chore(meta): update meta files

Casks/emacs-app-good/meta.json

@@ -13,7 +13,6 @@
   "appcast": null,
   "version": "2023-05-30.ecc1d99.master",
   "installed": null,
-  "installed_time": null,
   "outdated": false,
   "sha256": "4941b57bcab80bf7f5bcdbd3908c6e90bb754c6a37cc98d0b183ed254af65c40",
   "artifacts": [

Casks/emacs-app-monthly/meta.json

@@ -13,7 +13,6 @@
   "appcast": null,
   "version": "2023-11-19.16ac377.master",
   "installed": null,
-  "installed_time": null,
   "outdated": false,
   "sha256": "ce34dbbd9f3086e58da234eb7ab24c41896c19c54c8fa87a0cde528950b7e039",
   "artifacts": [

Casks/emacs-app-nightly-28/meta.json

@@ -13,7 +13,6 @@
   "appcast": null,
   "version": "2022-12-19.ae9bfed.emacs-28",
   "installed": null,
-  "installed_time": null,
   "outdated": false,
   "sha256": "28e611692ed2a09435a3225fa38a550954651cc8f3b116b571bd06b00dce458a",
   "artifacts": [

Casks/emacs-app-nightly-29/meta.json

@@ -13,7 +13,6 @@
   "appcast": null,
   "version": "2023-11-14.5a1808d.emacs-29",
   "installed": null,
-  "installed_time": null,
   "outdated": false,
   "sha256": "5b346a87ef0ba7f6e46d2dbad4253ea0d1d0ecbcf8abba8274c480061cad7784",
   "artifacts": [

Casks/emacs-app-nightly/meta.json

@@ -13,7 +13,6 @@
   "appcast": null,
   "version": "2023-11-22.366c316.master",
   "installed": null,
-  "installed_time": null,
   "outdated": false,
   "sha256": "5ba2682e23b46f89c783df5215efb1ae01e40c0360d0dfa84ec12030d820fb85",
   "artifacts": [

Casks/emacs-app-pretest/meta.json

@@ -13,7 +13,6 @@
   "appcast": null,
   "version": "29.0.92-pretest",
   "installed": null,
-  "installed_time": null,
   "outdated": false,
   "sha256": "4150ffaa13e27d4b6c440417bd56c85fd8beb15ac1fea13733d5cbcdd5895135",
   "artifacts": [

Casks/emacs-app/meta.json

@@ -13,7 +13,6 @@
   "appcast": null,
   "version": "29.1",
   "installed": null,
-  "installed_time": null,
   "outdated": false,
   "sha256": "06975a567a038f557f88d865f438aa838a4da3a1771885b747bcd416cb85c67c",
   "artifacts": [