Bump r-lib/actions from 2.6.3 to 2.6.4

Bumps [r-lib/actions](https://github.com/r-lib/actions) from 2.6.3 to 2.6.4.
- [Release notes](https://github.com/r-lib/actions/releases)
- [Commits](r-lib/actions@v2.6.3...v2.6.4)

---
updated-dependencies:
- dependency-name: r-lib/actions
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/R-CMD-check-wsl.yaml

@@ -37,11 +37,11 @@ jobs:
 
       - uses: actions/checkout@v3
 
-      - uses: r-lib/actions/setup-r@v2.6.3
+      - uses: r-lib/actions/setup-r@v2.6.4
         with:
           r-version: 'release'
           rtools-version: '42'
-      - uses: r-lib/actions/setup-pandoc@v2.6.3
+      - uses: r-lib/actions/setup-pandoc@v2.6.4
 
       - name: Query dependencies
         run: |

.github/workflows/R-CMD-check.yaml

@@ -56,11 +56,11 @@ jobs:
           sudo apt-get install -y libcurl4-openssl-dev || true
           sudo apt-get install -y openmpi-bin openmpi-common libopenmpi-dev || true
 
-      - uses: r-lib/actions/setup-r@v2.6.3
+      - uses: r-lib/actions/setup-r@v2.6.4
         with:
           r-version: ${{ matrix.config.r }}
           rtools-version: ${{ matrix.config.rtools }}
-      - uses: r-lib/actions/setup-pandoc@v2.6.3
+      - uses: r-lib/actions/setup-pandoc@v2.6.4
 
       - name: Query dependencies
         run: |

.github/workflows/Test-coverage.yaml

@@ -34,8 +34,8 @@ jobs:
         if: "!startsWith(github.ref, 'refs/tags/') && github.ref != 'refs/heads/master'"
       - uses: actions/checkout@v3
 
-      - uses: r-lib/actions/setup-r@v2.6.3
-      - uses: r-lib/actions/setup-pandoc@v2.6.3
+      - uses: r-lib/actions/setup-r@v2.6.4
+      - uses: r-lib/actions/setup-pandoc@v2.6.4
 
       - name: Install Ubuntu dependencies
         run: |
@@ -85,12 +85,12 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - uses: r-lib/actions/setup-r@v2.6.3
+      - uses: r-lib/actions/setup-r@v2.6.4
         with:
           r-version: 'release'
           rtools-version: '42'
 
-      - uses: r-lib/actions/setup-pandoc@v2.6.3
+      - uses: r-lib/actions/setup-pandoc@v2.6.4
 
       - name: Query dependencies
         run: |

.github/workflows/cmdstan-tarball-check.yaml

@@ -40,12 +40,12 @@ jobs:
           sudo apt-get install -y libcurl4-openssl-dev || true
           sudo apt-get install -y openmpi-bin openmpi-common libopenmpi-dev || true
 
-      - uses: r-lib/actions/setup-r@v2.6.3
+      - uses: r-lib/actions/setup-r@v2.6.4
         with:
           r-version: ${{ matrix.config.r }}
           rtools-version: ${{ matrix.config.rtools }}
 
-      - uses: r-lib/actions/setup-pandoc@v2.6.3
+      - uses: r-lib/actions/setup-pandoc@v2.6.4
 
       - name: Query dependencies
         run: |