feat: Upgrade Emscripten build to 3.1 (#43)

* chore: bump lz4 build

* chore: bump blosc build

* chore: bump zstd build

* Add changeset

Author: manzt

.changeset/clever-drinks-cough.md

@@ -0,0 +1,5 @@
+---
+'numcodecs': patch
+---
+
+Upgrade build system to Emscripten 3.1

codecs/blosc/blosc_codec.js

@@ -1,6 +1,6 @@
 {
   "name": "blosc",
   "scripts": {
-    "build": "docker run --rm -v $(pwd):/src emscripten/emsdk:2.0.8 ./build.sh"
+    "build": "docker run --rm -v $(pwd):/src emscripten/emsdk:3.1.51 ./build.sh"
   }
 }

codecs/blosc/blosc_codec.wasm

@@ -1,6 +1,6 @@
 {
   "name": "lz4",
   "scripts": {
-    "build": "docker run --rm -v $(pwd):/src emscripten/emsdk:2.0.8 ./build.sh"
+    "build": "docker run --rm -v $(pwd):/src emscripten/emsdk:3.1.51 ./build.sh"
   }
 }

codecs/blosc/package.json

@@ -1,6 +1,6 @@
 {
   "name": "lz4",
   "scripts": {
-    "build": "docker run --rm -v $(pwd):/src emscripten/emsdk:2.0.8 ./build.sh"
+    "build": "docker run --rm -v $(pwd):/src emscripten/emsdk:3.1.51 ./build.sh"
   }
 }