build(deps): bump slack-sdk from 3.26.2 to 3.30.0 in /tools/base

Bumps [slack-sdk](https://github.com/slackapi/python-slack-sdk) from 3.26.2 to 3.30.0.
- [Release notes](https://github.com/slackapi/python-slack-sdk/releases)
- [Changelog](https://github.com/slackapi/python-slack-sdk/blob/main/docs-v2/changelog.html)
- [Commits](slackapi/python-slack-sdk@v3.26.2...v3.30.0)

---
updated-dependencies:
- dependency-name: slack-sdk
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

tools/base/requirements.txt

@@ -691,9 +691,7 @@ google-apitools==0.5.32 \
 google-auth[aiohttp]==2.26.1 \
     --hash=sha256:2c8b55e3e564f298122a02ab7b97458ccfcc5617840beb5d0ac757ada92c9780 \
     --hash=sha256:54385acca5c0fbdda510cd8585ba6f3fcb06eeecf8a6ecca39d3ee148b092590
-    # via
-    #   google-auth
-    #   gsutil
+    # via gsutil
 google-reauth==0.1.1 \
     --hash=sha256:cb39074488d74c8853074dde47368bbf8f739d4a4338b89aab696c895b6d8368 \
     --hash=sha256:f9f6852a55c2c5453d581cd01f3d1278e86147c03d008409800390a834235892
@@ -1038,7 +1036,6 @@ pyjwt[crypto]==2.8.0 \
     # via
     #   gidgethub
     #   pygithub
-    #   pyjwt
 pylsqpack==0.3.18 \
     --hash=sha256:005ddce84bdcbf5c3cf99f764504208e1aa0a91a8331bf47108f2708f2a315e6 \
     --hash=sha256:06e1bbe47514b83cd03158e5558ef8cc44f578169c1820098be9f3cc4137f16a \
@@ -1196,9 +1193,9 @@ six==1.16.0 \
     #   pyu2f
     #   sphinxcontrib-httpdomain
     #   thrift
-slack-sdk==3.26.2 \
-    --hash=sha256:a10e8ee69ca17d274989d0c2bbecb875f19898da3052d8d57de0898a00b1ab52 \
-    --hash=sha256:bcdac5e688fa50e9357ecd00b803b6a8bad766aa614d35d8dc0636f40adc48bf
+slack-sdk==3.30.0 \
+    --hash=sha256:001a4013698d3f244645add49c80adf8addc3a6bf633193848f7cbae3d387e0b \
+    --hash=sha256:42d1c95f7159887ddb4841d461fbe7ab0c48e4968f3cd44eaaa792cf109f4425
     # via -r requirements.in
 smmap==5.0.1 \
     --hash=sha256:dceeb6c0028fdb6734471eb07c0cd2aae706ccaecab45965ee83f11c8d3b1f62 \