ci: drop full history fetch from lint and lockfile jobs

Biome, tsc and the i18n/lockfile scripts only read the working tree,
so a shallow clone is enough. Also run checkout and Bun setup in
parallel in update-issue-form for consistency.

.github/workflows/check-lockfile.yml

@@ -25,7 +25,6 @@ jobs:
               ref: ${{ github.event.pull_request.head.sha || github.sha }}
               show-progress: false
               submodules: recursive
-              fetch-depth: 0
 
           - name: 🍞 Setup Bun
             uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0

.github/workflows/linting.yml

@@ -45,7 +45,6 @@ jobs:
             with:
               ref: ${{ github.event.pull_request.head.sha || github.sha }}
               submodules: recursive
-              fetch-depth: 0
 
           - name: 🍞 Setup Bun
             uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0
@@ -90,7 +89,6 @@ jobs:
             with:
               ref: ${{ github.event.pull_request.head.sha || github.sha }}
               submodules: recursive
-              fetch-depth: 0
 
           - name: "🍞 Setup Bun"
             uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0

.github/workflows/update-issue-form.yml

@@ -25,19 +25,20 @@ jobs:
       contents: write
       pull-requests: write
     steps:
-      - name: 📥 Checkout repository
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          # On `release` events GITHUB_SHA is the tagged commit — without this the
-          # script would regenerate the form from the tag's (stale) copy and the bot
-          # PR would revert any form edits made on develop since that release.
-          ref: develop
+      - parallel:
+          - name: 📥 Checkout repository
+            uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+            with:
+              # On `release` events GITHUB_SHA is the tagged commit — without this the
+              # script would regenerate the form from the tag's (stale) copy and the bot
+              # PR would revert any form edits made on develop since that release.
+              ref: develop
 
-      - name: 🍞 Setup Bun
-        uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0
-        with:
-          # renovate: datasource=npm depName=bun
-          bun-version: "1.3.14"
+          - name: 🍞 Setup Bun
+            uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0
+            with:
+              # renovate: datasource=npm depName=bun
+              bun-version: "1.3.14"
 
       - name: 🔢 Populate version dropdown from GitHub releases
         id: populate