Bump actions/checkout to v4.3.0 everywhere (#7266)

Author: zeme-wana

.github/workflows/cabal-build-all.yml

@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@main
+        uses: actions/checkout@v4.3.0
 
       - name: Cold Build / ${{ matrix.ghc }} / x86_64-linux
         run: | 

.github/workflows/changelog-label.yml

@@ -19,7 +19,7 @@ jobs:
       issues: write
     steps:
       - name: Checkout
-        uses: actions/checkout@main
+        uses: actions/checkout@v4.3.0
 
       - name: Find Changed Files
         id: changed-files

.github/workflows/code-coverage-report.yml

@@ -19,7 +19,7 @@ jobs:
       name: github-pages
     steps:
       - name: Checkout
-        uses: actions/checkout@main
+        uses: actions/checkout@v4.3.0
 
       - name: Build Report
         run: | 

.github/workflows/compare-golden-budgets.yaml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@main
+        uses: actions/checkout@v4.3.0
         with:
           fetch-depth: 5
 

.github/workflows/cost-model-benchmark.yml

@@ -20,7 +20,7 @@ jobs:
     timeout-minutes: 1800 # (30 hours) These benchmarks take over 10 hours to run.
     steps:
       - name: Checkout
-        uses: actions/checkout@main
+        uses: actions/checkout@v4.3.0
 
       - name: Run Benchmark
         run: nix --accept-flake-config run .#cost-model-budgeting-bench -- --csv results.csv ${{ inputs.extra-bench-args }}

.github/workflows/haddock-site.yml

@@ -68,7 +68,7 @@ jobs:
       name: github-pages
     steps:
       - name: Checkout gh-pages
-        uses: actions/checkout@v4
+        uses: actions/checkout@v4.3.0
         with:
           ref: gh-pages
 
@@ -87,7 +87,7 @@ jobs:
           fi  
 
       - name: Checkout
-        uses: actions/checkout@main
+        uses: actions/checkout@v4.3.0
         with:
           ref: ${{ inputs.ref || github.ref_name }}
 

.github/workflows/longitudinal-benchmark.yml

@@ -29,7 +29,7 @@ jobs:
     runs-on: [self-hosted, plutus-benchmark]
     steps:
       - name: Checkout 
-        uses: actions/checkout@main 
+        uses: actions/checkout@v4.3.0 
 
       - name: Run Benchmarks
         env: 

.github/workflows/manual-benchmark.yml

@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@main
+        uses: actions/checkout@v4.3.0
         with:
           # We need at least one commit before master to compare against
           fetch-depth: 5

.github/workflows/metatheory-site.yml

@@ -53,7 +53,7 @@ jobs:
       name: github-pages
     steps:
       - name: Checkout
-        uses: actions/checkout@main
+        uses: actions/checkout@v4.3.0
         with:
           ref: ${{ inputs.ref || github.ref_name }}
 

.github/workflows/nightly-testsuite.yml

@@ -25,7 +25,7 @@ jobs:
     runs-on: [self-hosted, plutus-ci]
     steps:
       - name: Checkout
-        uses: actions/checkout@main
+        uses: actions/checkout@v4.3.0
 
       - name: Run Plutus Core Test
         run: |