fix !project_id error message typo (#435)

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Small change! This error message seems like it's missing a word, so
based on the comment on line 202, I changed it
from
> `⚠️ Failed to a project ID from the given inputs.`

to

> `⚠️ Failed to compute a project ID from the given inputs`

Author: seth-acuitymd

Diff for: src/main.ts

@@ -202,7 +202,7 @@ export async function run(logger: Logger) {
     // Set the project ID environment variables to the computed values.
     if (!projectID) {
       logger.info(
-        `⚠️ Failed to a project ID from the given inputs. Neither the ` +
+        `⚠️ Failed to compute a project ID from the given inputs. Neither the ` +
           `"project_id" output nor any environment variables will be ` +
           `exported. If you require these values in other steps, specify the ` +
           `"project_id" input directly.`,