fix: tweak workflow name

Author: kazupon

.github/workflows/nightly-release.yml

@@ -1,4 +1,4 @@
-name: nightly release
+name: Nightly release
 on:
   push:
     branches:

.github/workflows/size-data.yml

@@ -1,4 +1,4 @@
-name: size data
+name: Size data
 
 on:
   push:

.github/workflows/size-report.yml

@@ -1,8 +1,8 @@
-name: size report
+name: Size report
 
 on:
   workflow_run:
-    workflows: ['size data']
+    workflows: ['Size data']
     types:
       - completed