Fix path filtering: fetch-depth 2 for git diff HEAD~1

Shallow clones (fetch-depth: 1, the default) don't have a parent commit,
so git diff HEAD~1 HEAD fails silently and falls back to building all
projects. Adding fetch-depth: 2 to the changes job checkout ensures the
parent commit is available for the diff.

Author: mikemaccana-edwardbot

.github/workflows/anchor.yml

@@ -31,6 +31,8 @@ jobs:
       matrix: ${{ steps.matrix.outputs.matrix }}
     steps:
       - uses: actions/checkout@v5
+        with:
+          fetch-depth: 2
       - uses: dorny/paths-filter@v4
         id: changes
         if: github.event_name == 'pull_request'

.github/workflows/native.yml

@@ -31,6 +31,8 @@ jobs:
       matrix: ${{ steps.matrix.outputs.matrix }}
     steps:
       - uses: actions/checkout@v5
+        with:
+          fetch-depth: 2
       - uses: dorny/paths-filter@v4
         id: changes
         if: github.event_name == 'pull_request'

.github/workflows/pinocchio.yml

@@ -31,6 +31,8 @@ jobs:
       matrix: ${{ steps.matrix.outputs.matrix }}
     steps:
       - uses: actions/checkout@v5
+        with:
+          fetch-depth: 2
       - uses: dorny/paths-filter@v4
         id: changes
         if: github.event_name == 'pull_request'

.github/workflows/quasar.yml

@@ -33,6 +33,8 @@ jobs:
       matrix: ${{ steps.matrix.outputs.matrix }}
     steps:
       - uses: actions/checkout@v5
+        with:
+          fetch-depth: 2
       - uses: dorny/paths-filter@v4
         id: changes
         if: github.event_name == 'pull_request'