refactor: Fixes strings to prevent PHP 8.2 notices (#140)

PHP 8.2 throws deprecation notices on this string interpolation syntax.
Does not affect the environment variable syntax in the config settings.
No functional changes, backward compatible with PHP 7.

Author: cstuder

examples/InvokableScripts.php

@@ -74,7 +74,7 @@
 $tables = $scriptsApi->invokeScript($createdScript->getId(), ["bucket_name" => $bucket]);
 foreach ($tables as $table) {
     foreach ($table->records as $record) {
-        print "\n${record['time']} ${record['location']}: ${record['_field']} ${record['_value']}";
+        print "\n{$record['time']} {$record['location']}: {$record['_field']} {$record['_value']}";
     }
 }
 
@@ -85,7 +85,7 @@
 print "\n------- Invoke to Stream of FluxRecords -------\n";
 $records = $scriptsApi->invokeScriptStream($createdScript->getId(), ["bucket_name" => $bucket]);
 foreach ($records->each() as $record) {
-    print "\n${record['time']} ${record['location']}: ${record['_field']} ${record['_value']}";
+    print "\n{$record['time']} {$record['location']}: {$record['_field']} {$record['_value']}";
 }
 
 //
@@ -94,7 +94,7 @@
 print "\n";
 print "\n------- Invoke to Raw-------\n";
 $raw = $scriptsApi->invokeScriptRaw($createdScript->getId(), ["bucket_name" => $bucket]);
-print "RAW output:\n\n ${raw}";
+print "RAW output:\n\n {$raw}";
 
 //
 // List scripts

src/InfluxDB2/DefaultApi.php

@@ -200,7 +200,7 @@ function ($v, $k) {
                 $this->options,
                 array_keys($this->options)
             ));
-            throw new InvalidArgumentException("The '${key}' should be defined as argument or default option: {$options}");
+            throw new InvalidArgumentException("The '{$key}' should be defined as argument or default option: {$options}");
         }
     }
 

src/InfluxDB2/InvokableScriptsApi.php

@@ -133,6 +133,6 @@ public function invokeScriptRaw(string $scriptId, array $params = null): ?string
 
     private function _invokeScript(ScriptInvocationParams $invocation_params, string $scriptId): StreamInterface
     {
-        return $this->post($invocation_params->__toString(), "/api/v2/scripts/${scriptId}/invoke", [])->getBody();
+        return $this->post($invocation_params->__toString(), "/api/v2/scripts/{$scriptId}/invoke", [])->getBody();
     }
 }