Bump peter-evans/create-pull-request from 5 to 6 (#2991)

Bumps
[peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request)
from 5 to 6.

Author: dependabot[bot]

.github/workflows/cargo-update.yml

@@ -37,7 +37,7 @@ jobs:
             git diff
           fi
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v5
+        uses: peter-evans/create-pull-request@v6
         with:
           commit-message: Upgrade cargo dependencies to ${{ env.today }}
           branch: cargo-update-${{ env.today }}

.github/workflows/cbmc-update.yml

@@ -63,7 +63,7 @@ jobs:
 
       - name: Create Pull Request
         if: ${{ env.next_step == 'create_pr' }}
-        uses: peter-evans/create-pull-request@v5
+        uses: peter-evans/create-pull-request@v6
         with:
           commit-message: Upgrade CBMC from ${{ env.CBMC_VERSION }} to ${{ env.CBMC_LATEST }}
           branch: cbmc-${{ env.CBMC_LATEST }}

.github/workflows/toolchain-upgrade.yml

@@ -68,7 +68,7 @@ jobs:
           fi
       - name: Create Pull Request
         if: ${{ env.next_step == 'create_pr' }}
-        uses: peter-evans/create-pull-request@v5
+        uses: peter-evans/create-pull-request@v6
         with:
           commit-message: Upgrade Rust toolchain to nightly-${{ env.next_toolchain_date }}
           branch: toolchain-${{ env.next_toolchain_date }}