Ported from my Modrinth modpack: https://modrinth.com/modpack/recording-client-for-vanilla-mc-servers/version/1.21-1.0.1

Changes from the Modrinth version (1.21-1.0.1):

• Updated Replay Mod to v2.6.20
• Added "Text Placeholder API" mod (required by "Mod Menu")

Changelog (Copied from Modrinth):

The Minecraft 1.21 Modpack Update! 😃

Changelog (Quick Summary):

• Updated all mods to MC 1.21
• Replaced mods that don't have 1.21 versions with other mods that have similar functionality.

Changelog (Details):

v1.0.1 Changelog:

• Fixed download showing the wrong name in the launcher.

v1.0.0 Changelog:

Added Mods:

(Most are to replace mods that didn't update to 1.21 as of the time of releasing this modpack).

• Added Cubes Without Borders (adds borderless fullscreen mode!) (replaces "Borderless Mining")
• Added Cull Leaves (to replace Cull Less Leaves)
• Added Lighty (to replace Light Overlay mod)
• Added RyoamicLights (to replace LambDynamicLights)
• Added ObsidianUI (support mod for RyoamicLights)

Removed Mods:

• Removed Borderless Mining (No MC 1.21 version released yet)
• Removed Cull Less Leaves (no MC 1.21 version released yet)
• Removed LazyDFU (no MC 1.21 version released)
• Removed Light Overlay (no MC 1.21 version released yet on Modrinth)
• Removed LambDynamicLights (no MC 1.21 version released yet)
• Removed Memory Leak Fix (waiting on mod update)
• Removed MidnightLib (library mod. Not needed anymore)

Config Changes:

• Set RyoamicLights "Dynamic Lights" to "Fast" by default, to reduce lag on slow computers.

Updated Mods:

• Updated to Minecraft 1.21
• Updated Fabric loader (to 0.16.5)
• Updated Fabric API (to 0.102.0)
• Updated Architectury API (to 13.0.6)
• Updated Better Ping Display (to 1.21-1.1.1)
• Updated BetterF3 (to 11.0.1)
• Updated Bobby (to 5.2.4)
• Updated CIT Resewn (to 1.2.0)
• Updated Chat Heads (to 0.13.0)
• Updated Cloth Config API (to 15.0.140)
• Updated Controlling (to 18.0.4)
• Updated Debugify (to 1.21+1.0)
• Updated FerriteCore (to 7.0.0)
• Updated "Freecam (Modrinth Edition)" (to 1.3.0)
• Updated ImmediatelyFast (to 1.2.21)
• Updated Indium (to 1.0.35)
• Updated Iris Shaders (to 1.7.3)
• Updated Litematica (to 0.19.50)
• Updated Lithium (to 0.13.0)
• Updated MaLiLib (to 0.21.0)
• Updated MidnightControls (to 1.9.7)
• Updated MiniHUD (to 0.32.50)
• Updated Mod Menu (to 11.0.2)
• Updated Motschen's Better Leaves resource pack (to 8.0)
• Updated No Chat Reports (to 2.8.0)
• Updated Reese's Sodium Options (to 1.7.3)
• Updated ReplayMod (to 2.6.19)
• Updated Searchables (to 1.0.5)
• Updated Simple Voice Chat (to 2.5.22)
• Updated Sodium (to 0.5.11)
• Updated Sodium Extra (to 0.5.7)
• Updated WI Zoom (to 1.5)
• Updated YetAnotherConfigLib (to 3.5.0)
• Updated Shulker Box Tooltip (to 5.1.1)

Skipped Updating:

• Kept Mixin Conflict Helper (latest v1.2.0 is still compatible with MC 1.21)
• Kept MixinTrace (latest v1.1.1 is still compatible with MC 1.21)