chore: embed timezone data on all builds

Fixes memo count always loading due to "invalid timezone location" API error on Windows and other systems without timezone data available.

This will increase binaries by about 800 Kb, but this ensures the server works in any environment.

References:
- https://pkg.go.dev/time#LoadLocation
- golang/go@6d63a74

.goreleaser-testing.yaml

@@ -23,6 +23,7 @@ builds:
       - linux_s390x
     flags: >-
       -trimpath
+      -tags=timetzdata
     ldflags: >-
       -s
       -w

.goreleaser.yaml

@@ -42,6 +42,7 @@ builds:
         goarch: "386"
     flags: >-
       -trimpath
+      -tags=timetzdata
     ldflags: >-
       -s
       -w