build(deps): bump oss-fuzz-base/base-builder-python in /.clusterfuzzlite

Bumps oss-fuzz-base/base-builder-python from `485af05` to `6b2b3a7`.

---
updated-dependencies:
- dependency-name: oss-fuzz-base/base-builder-python
  dependency-version: 6b2b3a7e4a2da50de47f94925cffbe34747e1aae4f33d7f07ba6c681dd648b23
  dependency-type: direct:production
...

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

Author: dependabot[bot]

.clusterfuzzlite/Dockerfile

@@ -6,7 +6,7 @@
 # Pinned by digest for supply-chain integrity. Bump periodically (the OSS-Fuzz
 # base-builder is updated frequently with toolchain fixes); resolve a fresh digest with:
 #   docker buildx imagetools inspect gcr.io/oss-fuzz-base/base-builder-python:latest --format '{{.Manifest.Digest}}'
-FROM gcr.io/oss-fuzz-base/base-builder-python@sha256:485af05cc843949fd60d0e6e78b1a4922e661baf9af5eb595f9b96f563b42748
+FROM gcr.io/oss-fuzz-base/base-builder-python@sha256:6b2b3a7e4a2da50de47f94925cffbe34747e1aae4f33d7f07ba6c681dd648b23
 
 COPY . $SRC/haystack
 WORKDIR $SRC/haystack