build(deps): bump pip-compile-multi from 2.1.0 to 2.6.2 in /requirements

Bumps [pip-compile-multi](https://github.com/peterdemin/pip-compile-multi) from 2.1.0 to 2.6.2.
- [Release notes](https://github.com/peterdemin/pip-compile-multi/releases)
- [Changelog](https://github.com/peterdemin/pip-compile-multi/blob/master/HISTORY.rst)
- [Commits](peterdemin/pip-compile-multi@v2.1.0...v2.6.2)

---
updated-dependencies:
- dependency-name: pip-compile-multi
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements/integration.txt

@@ -5,26 +5,66 @@
 #
 #    pip-compile-multi
 #
-appdirs==1.4.4            # via virtualenv
-cfgv==3.2.0               # via pre-commit
-click==7.1.2              # via pip-compile-multi, pip-tools
-distlib==0.3.1            # via virtualenv
-filelock==3.0.12          # via tox, virtualenv
-identify==1.5.9           # via pre-commit
-nodeenv==1.5.0            # via pre-commit
-packaging==20.4           # via tox
-pip-compile-multi==2.1.0  # via -r requirements/integration.in
-pip-tools==5.3.1          # via pip-compile-multi
-pluggy==0.13.1            # via tox
-pre-commit==2.8.2         # via -r requirements/integration.in
-py==1.9.0                 # via tox
-pyparsing==2.4.7          # via packaging
-pyyaml==5.3.1             # via pre-commit
-six==1.15.0               # via packaging, pip-tools, tox, virtualenv
-toml==0.10.2              # via pre-commit, tox
-toposort==1.5             # via pip-compile-multi
-tox==3.20.1               # via -r requirements/integration.in
-virtualenv==20.1.0        # via pre-commit, tox
+appdirs==1.4.4
+    # via virtualenv
+build==0.10.0
+    # via pip-tools
+cfgv==3.2.0
+    # via pre-commit
+click==8.1.3
+    # via
+    #   pip-compile-multi
+    #   pip-tools
+distlib==0.3.1
+    # via virtualenv
+filelock==3.0.12
+    # via
+    #   tox
+    #   virtualenv
+identify==1.5.9
+    # via pre-commit
+nodeenv==1.5.0
+    # via pre-commit
+packaging==20.4
+    # via
+    #   build
+    #   tox
+pip-compile-multi==2.6.2
+    # via -r integration.in
+pip-tools==6.12.2
+    # via pip-compile-multi
+pluggy==0.13.1
+    # via tox
+pre-commit==2.8.2
+    # via -r integration.in
+py==1.9.0
+    # via tox
+pyparsing==2.4.7
+    # via packaging
+pyproject-hooks==1.0.0
+    # via build
+pyyaml==5.3.1
+    # via pre-commit
+six==1.15.0
+    # via
+    #   packaging
+    #   tox
+    #   virtualenv
+toml==0.10.2
+    # via
+    #   pre-commit
+    #   tox
+toposort==1.5
+    # via pip-compile-multi
+tox==3.20.1
+    # via -r integration.in
+virtualenv==20.1.0
+    # via
+    #   pre-commit
+    #   tox
+wheel==0.38.4
+    # via pip-tools
 
 # The following packages are considered to be unsafe in a requirements file:
 # pip
+# setuptools