Pin Swoole base to released 6.2.0 instead of nightly

The nightly self-reports as 6.2.1 even though no such release exists
upstream — it's just master's in-development version after v6.2.0.
Pin to the actual released 6.2.0-php8.5-alpine image for clarity.

Tests now assert exact versions (PHP 8.5.4, Swoole 6.2.0) since the
base image is fully pinned and won't drift.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: loks0n

Dockerfile

@@ -1,4 +1,4 @@
-ARG BASE_IMAGE="phpswoole/swoole:php8.5-alpine@sha256:ba7d2d342ba0e3fef134098fcb95a9bc2de278e14ed5d775f683a412c3a66790"
+ARG BASE_IMAGE="phpswoole/swoole:6.2.0-php8.5-alpine"
 ARG PHP_BUILD_DATE="20250925"
 
 FROM $BASE_IMAGE AS compile

tests.yaml

@@ -92,7 +92,7 @@ commandTests:
     command: "php"
     args: ["-v"]
     expectedOutput:
-      - "PHP 8\\.5\\.\\d+ \\(cli\\).*"
+      - "PHP 8.5.4 (cli)*"
   - name: 'ImageMagick supported formats'
     command: "php"
     args: ["-i"]
@@ -107,7 +107,7 @@ commandTests:
     command: "php"
     args: ["--re", "swoole"]
     expectedOutput:
-      - ".*version 6\\.2\\.\\d+.*"
+      - ".*version 6.2.0.*"
   - name: 'ZIP'
     command: "zip"
     args: ["-v"]