fix: bump CI Go toolchain to 1.26.6

govulncheck fails on stdlib advisories in 1.26.5 that are patched in 1.26.6.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: ChiragAgg5k

.github/workflows/audit.yml

@@ -141,7 +141,7 @@ jobs:
           sdk: stable
       - uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7.0.0
         with:
-          go-version: "1.26.5"
+          go-version: "1.26.6"
       - name: Install OSV Scanner
         run: go install github.com/google/osv-scanner/v2/cmd/osv-scanner@${{ env.OSV_SCANNER_VERSION }}
       - name: Audit Dart templates
@@ -167,7 +167,7 @@ jobs:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7.0.0
         with:
-          go-version: "1.26.5"
+          go-version: "1.26.6"
           cache: false
       - name: Install govulncheck
         run: go install golang.org/x/vuln/cmd/govulncheck@v1.1.4
@@ -247,7 +247,7 @@ jobs:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7.0.0
         with:
-          go-version: "1.26.5"
+          go-version: "1.26.6"
       - name: Install OSV Scanner
         run: go install github.com/google/osv-scanner/v2/cmd/osv-scanner@${{ env.OSV_SCANNER_VERSION }}
       - name: Audit Maven coordinates in deps.gradle