Swap CentOS image with AlmaLinux (for linux prebuilds)

Which means classic-level now requires glibc 2.28 (same as Node.js
18) instead of glibc 2.17. Would be a breaking change if an earlier
commit didn't already drop support of Node.js < 18.

Ref: prebuild/docker-images#38
Category: change

README.md

@@ -93,7 +93,7 @@ const xyz = db.sublevel<string, any>('xyz', { valueEncoding: 'json' })
 
 We aim to support Active LTS and Current Node.js releases, Electron >= 30, as well as any future Node.js and Electron releases thanks to [Node-API](https://nodejs.org/api/n-api.html).
 
-The `classic-level` npm package ships with prebuilt binaries for popular 64-bit platforms as well as ARM, M1, Android (built against Node.js core rather than the [`nodejs-mobile`](https://github.com/JaneaSystems/nodejs-mobile) fork), Alpine (musl), Windows 32-bit, Linux flavors with an old glibc (Debian 8, Ubuntu 14.04, RHEL 7, CentOS 7) and is known to work on:
+The `classic-level` npm package ships with prebuilt binaries for popular 64-bit platforms as well as ARM, M1, Android, Alpine (musl), Windows 32-bit, Linux flavors with an old glibc (2.28) and is known to work on:
 
 - **Linux**, including ARM platforms such as Raspberry Pi and Kindle
 - **Mac OS** (10.7 and later)

package.json

@@ -21,7 +21,7 @@
     "prepublishOnly": "npm run dependency-check",
     "prebuild-linux-arm": "prebuildify-cross -i linux-armv6 -i linux-armv7 -i linux-arm64-lts -t 18.20.4 --napi --strip",
     "prebuild-android-arm": "prebuildify-cross -i android-armv7 -i android-arm64 -t 18.20.4 --napi --strip",
-    "prebuild-linux-x64": "prebuildify-cross -i centos7-devtoolset7 -i alpine -t 18.20.4 --napi --strip",
+    "prebuild-linux-x64": "prebuildify-cross -i almalinux-devtoolset11 -i alpine -t 18.20.4 --napi --strip",
     "prebuild-darwin-x64+arm64": "prebuildify -t 18.20.4 --napi --strip --arch x64+arm64",
     "prebuild-win32-x86": "prebuildify -t 18.20.4 --napi --strip",
     "prebuild-win32-x64": "prebuildify -t 18.20.4 --napi --strip"