update to latest workflows version (#73)

Author: bjlittle

.github/workflows/ci-manifest.yml

@@ -23,4 +23,4 @@ concurrency:
 jobs:
   manifest:
     name: "check-manifest"
-    uses: scitools/workflows/.github/workflows/ci-manifest.yml@2023.03.3
+    uses: scitools/workflows/.github/workflows/ci-manifest.yml@2023.04.1

.github/workflows/refresh-lockfiles.yml

@@ -18,5 +18,5 @@ concurrency:
 
 jobs:
   refresh_lockfiles:
-    uses: scitools/workflows/.github/workflows/refresh-lockfiles.yml@2023.03.3
+    uses: scitools/workflows/.github/workflows/refresh-lockfiles.yml@2023.04.1
     secrets: inherit