Update Node from 18.20.3 LTS to 20.18.0 in precompiled releases. (#1476)

Update Node from 18.20.3 LTS to 20.18.0 in precompiled releases. This
does have an effect of retroactively updating Node version also to old
releases, but this is expected to be fine.

docker/Dockerfile

diff --git a/docker/Dockerfile b/docker/Dockerfile
index e70df96..19027d4 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -63,7 +63,7 @@
 # using `--entrypoint /bin/bash` in CLI).
 # This corresponds to the env variables set during: `source ./emsdk_env.sh`
 ENV EMSDK=/emsdk \
-    PATH="/emsdk:/emsdk/upstream/emscripten:/emsdk/node/18.20.3_64bit/bin:${PATH}"
+    PATH="/emsdk:/emsdk/upstream/emscripten:/emsdk/node/20.18.0_64bit/bin:${PATH}"
 
 # ------------------------------------------------------------------------------
 # Create a 'standard` 1000:1000 user

emsdk_manifest.json

diff --git a/emsdk_manifest.json b/emsdk_manifest.json
index ec7c9f4..ab9f6cf 100644
--- a/emsdk_manifest.json
+++ b/emsdk_manifest.json
@@ -392,14 +392,14 @@
   {
     "version": "releases-%releases-tag%",
     "bitness": 64,
-    "uses": ["node-18.20.3-64bit", "releases-%releases-tag%-64bit"],
+    "uses": ["node-20.18.0-64bit", "releases-%releases-tag%-64bit"],
     "os": "linux",
     "custom_install_script": "emscripten_npm_install"
   },
   {
     "version": "releases-%releases-tag%",
     "bitness": 64,
-    "uses": ["node-18.20.3-64bit", "python-3.9.2-64bit", "releases-%releases-tag%-64bit"],
+    "uses": ["node-20.18.0-64bit", "python-3.9.2-64bit", "releases-%releases-tag%-64bit"],
     "os": "macos",
     "arch": "x86_64",
     "custom_install_script": "emscripten_npm_install"
@@ -407,7 +407,7 @@
   {
     "version": "releases-%releases-tag%",
     "bitness": 64,
-    "uses": ["node-18.20.3-64bit", "python-3.9.2-64bit", "releases-%releases-tag%-64bit"],
+    "uses": ["node-20.18.0-64bit", "python-3.9.2-64bit", "releases-%releases-tag%-64bit"],
     "os": "macos",
     "arch": "arm64",
     "custom_install_script": "emscripten_npm_install"
@@ -415,7 +415,7 @@
   {
     "version": "releases-%releases-tag%",
     "bitness": 64,
-    "uses": ["node-18.20.3-64bit", "python-3.9.2-nuget-64bit", "java-8.152-64bit", "releases-%releases-tag%-64bit"],
+    "uses": ["node-20.18.0-64bit", "python-3.9.2-nuget-64bit", "java-8.152-64bit", "releases-%releases-tag%-64bit"],
     "os": "win",
     "custom_install_script": "emscripten_npm_install"
   }

test/test.py

diff --git a/test/test.py b/test/test.py
index 9dde71b..fbf4e9f 100755
--- a/test/test.py
+++ b/test/test.py
@@ -176,9 +176,9 @@
 
     # Test the normal tools like node don't re-download on re-install
     print('another install must re-download')
-    checked_call_with_output(emsdk + ' uninstall node-18.20.3-64bit')
-    checked_call_with_output(emsdk + ' install node-18.20.3-64bit', expected='Downloading:', unexpected='already installed')
-    checked_call_with_output(emsdk + ' install node-18.20.3-64bit', unexpected='Downloading:', expected='already installed')
+    checked_call_with_output(emsdk + ' uninstall node-20.18.0-64bit')
+    checked_call_with_output(emsdk + ' install node-20.18.0-64bit', expected='Downloading:', unexpected='already installed')
+    checked_call_with_output(emsdk + ' install node-20.18.0-64bit', unexpected='Downloading:', expected='already installed')
 
   def test_tot_upstream(self):
     print('test update-tags')